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find k for real roots 2x²+kx+3=0

Posted by Aayush Gupta 5 years, 1 month ago

CBSE > Class 10 > Mathematics

2 answers

........ ...... 5 years, 1 month ago

Here, a=2, b=k, c=3 D=b^2-4ac/2a =k^2-4×2×3/2×2 =K^2-24/4=0 k^2=24 K=√24 .......It may helpful to you.

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Yogita Ingle 5 years, 1 month ago

We have to find the values of k for quadratic equations 2x² + kx + 3 = 0 so that they have two equal roots.

we know, quadratic equation will be equal only when

discriminant, D = b² - 4ac = 0

on comparing 2x² + kx + 3 = 0 with general form of quadratic equation , ax² + bx + c = 0 we get, a = 2, b = k and c = 3

so Discriminant , D = (k)² - 4(2)(3) = 0

or, k² - 24 = 0

or, k = ± √24 = ±2√6

hence, the value of k = 2√6 or -2√6

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ANSWER

On dividing a polynomial 6x2 +8x3 + 27x2+21x+7 by another polynomial 3x2+4x+1 the remainder is in the form 2x+6 find a&b

Posted by Almasroshan Almasroshan 5 years, 1 month ago

CBSE > Class 10 > Mathematics

0 answers

ANSWER

find a relation between X and Y such that the point X Y is equal distance from the point 3,6 and - 3,4

Posted by Manisha 5 years, 1 month ago

CBSE > Class 10 > Mathematics

1 answers

Sandhya Raathi 5 years, 1 month ago

Exercise 9.1

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ANSWER

If the coordinates of A and B are (a,1) & (8,a) respectively and the distance AB=15 units...then what is 'a' ??

Posted by Khushi Gangwani 5 years, 1 month ago

CBSE > Class 10 > Mathematics

1 answers

Manisha 5 years, 1 month ago

(9+√401)/2 (9-√401)/2

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ANSWER

Worksheet 37

Posted by Saurabh Rawat Singh Rawat 5 years, 1 month ago

CBSE > Class 10 > Mathematics

0 answers

ANSWER

Ifα and β are the zeroes of the polynomial x²+5x+6,then the value of 1/α+1/β+αβ is *

Posted by Suhas M 5 years, 1 month ago

CBSE > Class 10 > Mathematics

1 answers

........ ...... 5 years, 1 month ago

Here, a=1,b=5,c=6 alpha+beta=-b/a =-5/1 Alpha+beta=-5,.......(i) And alpha×beta=c/a=6/1 Alpha×beta=6.......(ii) Now, 1/alpha+1beta+alpha×beta= Beta+alpha/alpha×beta+alpha×beta =-5/6+6 (from equation i and ii) =31/6 .......It may helpful to you

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16/9-7/9 how to solve explain

Posted by Kartik Yadav 5 years, 1 month ago

CBSE > Class 10 > Mathematics

5 answers

Manisha 5 years, 1 month ago

16/9-7/9 9/9 = 1 Right answer.....

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☆•..¤( Prateek )¤..•☆ 5 years, 1 month ago

16/9-7/9=9/9=1 hi hoga ?✌

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Shashank Sen 5 years, 1 month ago

16/9-7/9=9/9=1 hai

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Priyanshu ?✌??? 5 years, 1 month ago

16/9-7/9=9/9=1

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........ ...... 5 years, 1 month ago

16/9-7/9=9/9=1

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ANSWER

-2x=14

Posted by Vishal Kumar Kurrey Maths Xi A 5 years, 1 month ago

CBSE > Class 10 > Mathematics

5 answers

Abhinav Lal Karn 5 years, 1 month ago

-7

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Priyanshu ?✌??? 5 years, 1 month ago

-7

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........ ...... 5 years, 1 month ago

= -7

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☆•..¤( Prateek )¤..•☆ 5 years, 1 month ago

Khud hi question ask kiya aur khud hi answer de diya??????

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Vishal Kumar Kurrey Maths Xi A 5 years, 1 month ago

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How to solve ex.1.3 question answer in short trick

Posted by Nishant Bhardwaj 5 years, 1 month ago

CBSE > Class 10 > Mathematics

3 answers

☆•..¤( Prateek )¤..•☆ 5 years, 1 month ago

Yes leave it

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Yogesh Thakur 5 years, 1 month ago

Leave it .

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Sonam Kumari Paswan 5 years, 1 month ago

yes

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Point(4 , -3) is at perpendicular distance of _____ from the x-axis

Posted by Shalvi Rajpura 5 years, 1 month ago

CBSE > Class 10 > Mathematics

0 answers

ANSWER

Theorem 1.5 Let x be a rational number whose decimal expansion terminates. Then x can be expressed in the form of p/q, where p and q are coprime, and the prime factorisation of q is of the form of 2 to the power n ×5 to the power m are non negative integers.

Posted by Shardul Rai 5 years, 1 month ago

CBSE > Class 10 > Mathematics

1 answers

Gaurav Seth 3 years, 7 months ago

Given : x is a rational number whose decimal expansion terminates . p&q are two integers in which prime Factorisation of q is of the form 2^m5^n where p&q are co-prime & non negative integer

To Find : How x can be expressed

Solution :

• Consider the theorm ,

Let x be a rational number whose decimal expansion terminates.

Then x can be expressed in the form of p/q , where p and q are coprime and the prime factorisation of q is of the form 2^n5^m

, where n, m are non-negative integers.

•According to theorm

X can be expressed in the form of p/q

•Hence , X can be expressed in the form of p/q

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ANSWER

If sin theta is = 4/5 find the value of 4 tan theta -5cos theta/ sec theta + 4cot theta

Posted by Arpit Gandhi 5 years, 1 month ago

CBSE > Class 10 > Mathematics

1 answers

Gaurav Seth 5 years ago

sin theta=p/h=4/5 so we should find b from this equation

b=✓h²-p²

✓5²-4²

✓25-16

✓9=3

4tan theta - 5 cos theta by sec theta + 4 cot theta

4×p/b - 5×b/h divide by h/b + 4×b/p

4×4/3 - 5×3/5 divide by 5/3 + 4×3/4

16/3-3 by 5/3+ 3

7/3 by 14/3

3_3cancel

7/14=1/2

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Solve (2x-3)=25

Posted by Devika Joshi 5 years, 1 month ago

CBSE > Class 10 > Mathematics

5 answers

Shubham Saxena ???? 5 years, 1 month ago

2x - 3 = 25 ,, 2x = 25 + 3 ,, x = 28 / 2 ,, x = 14 ......

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☆•..¤( Prateek )¤..•☆ 5 years, 1 month ago

2x-3=25 =》2x=25+3 =》x=28/2 =》x=14

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Abhinav Lal Karn 5 years, 1 month ago

2x=25+3=》2x=28=》x=28/2=》x=14

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Priyanshu ?✌??? 5 years, 1 month ago

(2x-3)=25 2x=25+3 =x=28/2 =x=14

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........ ...... 5 years, 1 month ago

2x-3=25 2x=25+3 x=28/2 x=14

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The number of decimal place after which the decimal expansion of the rational number 23/2square mutilation 5 will terminate is

Posted by Anandam Ramesh 5 years, 1 month ago

CBSE > Class 10 > Mathematics

1 answers

Ansh Tyagi 5 years, 1 month ago

After 2 places

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what is square of34

Posted by Aryan Sharma 5 years, 1 month ago

CBSE > Class 10 > Mathematics

5 answers

Shubham Saxena ???? 5 years, 1 month ago

34² = 1156 .

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Abhinav Lal Karn 5 years, 1 month ago

(34)^2=1156

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Priyanshu ?✌??? 5 years, 1 month ago

1156

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Kartik Yadav 5 years, 1 month ago

1156

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Soham Shah 5 years, 1 month ago

1156

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Point (4,_3) is at a perpendicular distance ot from the x_ axis

Posted by Suresh Bhai 5 years, 1 month ago

CBSE > Class 10 > Mathematics

1 answers

Virendra Choudhary 5 years, 1 month ago

3 unit

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For the given quardratic equcation 5x+3y=5 state the root. 1,0 2,1 _1,_2 0,1

Posted by Suresh Bhai 5 years, 1 month ago

CBSE > Class 10 > Mathematics

0 answers

ANSWER

if 0.3528 is expanded in the form of p/2m5n find the smallest value of m, n, p.

Posted by Soorya V 5 years, 1 month ago

CBSE > Class 10 > Mathematics

0 answers

ANSWER

Embacment question

Posted by Aditya Rajawat 5 years, 1 month ago

CBSE > Class 10 > Mathematics

0 answers

ANSWER

Sin2B=2SinB

Posted by Aditya Kumar Rajput 5 years, 1 month ago

CBSE > Class 10 > Mathematics

1 answers

Hiya Suthar 5 years, 1 month ago

1Thank You

ANSWER

Is there anybody who know that when cbse will release sample paper of board 2020-21?

Posted by Tanu Man 5 years, 1 month ago

CBSE > Class 10 > Mathematics

5 answers

Sharma G 5 years, 1 month ago

Yes I know CBSE will release sample in the end of year .. Probably November...

3Thank You

Anushka Mittal 5 years, 1 month ago

There is no such information given by CBSE .

1Thank You

Priyanshu ?✌??? 5 years, 1 month ago

Don't know

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Priya ✧*｡٩(๑˙╰╯˙๑)و✧*｡ 5 years, 1 month ago

Sorry but I don't know ??

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Shreya Raj 5 years, 1 month ago

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ANSWER

Given sin(A+B)=SinA cosB +cosA sinB then find the value of sin 75°

Posted by Nikhil Joshi 5 years, 1 month ago

CBSE > Class 10 > Mathematics

2 answers

Manpreet Yadav 5 years, 1 month ago

Let A=45°,B=30° (so that sum of A and B =75° and we can get Sin74°) (put the value of A and B in equation) - Sin75°=Sin45°*Cos30° + Cos 45°*Sin30° - Sin75° = 1/√2*√3/2 + 1/√2*1/2 - Sin75° = √3/2√2 + 1/2√2 - Sin75° = (√3+1)/2√2 Sin75° = (√6+√2)/4

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Utsav Kumar 5 years, 1 month ago

sin ( A+ B) = sin75° Let A = 45° and B = 30° Then sin75° = sin45° cos30° + cos45° sin30° = 1/√2 * √3/2 + 1/√2 * 1/2 = √3 / 2√2 + 1/2√2 = √3 + 1/2√2 You can rationalise the denominator.

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ANSWER

Find the nature of the equation 2X^2-5X-7=0.

Posted by Dharani Vinayak 5 years, 1 month ago

CBSE > Class 10 > Mathematics

3 answers

Parth Gupta 5 years, 1 month ago

2x^2-5x-7x=0 2x^2-5x-7 (2x^2-7x)+(2x-7) x(2x-7)+1(2x-7) (x+1)(2x-7)

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Gaurav Seth 5 years, 1 month ago

Answer:the roots are not real

Step-by-step explanation:

comparing the equation in ax^2+bx+c=0

a=2

b=-5

c=7

Delta =b^2-4ac

=25-4 x 2 x 7

=25-56

= -31

It describes that the roots are imaginary or do not exist .

0Thank You

Gaurav Seth 5 years, 1 month ago

Answer:the roots are real and equal

Step-by-step explanation:

comparing the equation in ax^2+bx+c=0

a=2

b=-5

c=7

Delta =b^2-4ac

=25-4 x 2 x 7

=25-56

= -31

It describes that the roots are imaginary or do not exist .

0Thank You

ANSWER

Sin 60 = ????

Posted by Dharani Vinayak 5 years, 1 month ago

CBSE > Class 10 > Mathematics

3 answers

Utsav Kumar 5 years, 1 month ago

Sorry for wrong answer the answer is. √3/2

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Utsav Kumar 5 years, 1 month ago

Sin60° = √3/3

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........ ...... 5 years, 1 month ago

Sin 60°=√3/2

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ANSWER

The emperical relationship bet mean, mode and median ???

Posted by Dharani Vinayak 5 years, 1 month ago

CBSE > Class 10 > Mathematics

1 answers

Gaurav Seth 5 years, 1 month ago

ANSWER
Empirical relationship between mean, median and mode is:
Mode = 3 Median - 2 Mean
⇒ Mode - Mean = 3 Median - 2 Mean - Mean
⇒ Mode - Mean = 3 Median - 3 Mean
⇒ Mode - Mean = 3 [Median - Mean]

1Thank You

ANSWER

After how many palces will the rational number 1251/125 terminate

Posted by Joy Timothy 5 years, 1 month ago

CBSE > Class 10 > Mathematics

2 answers

Ansh Tyagi 5 years, 1 month ago

It will end after 3 decimal places u should use the trick to do it instead of dividing

1Thank You

Gaurav Seth 5 years, 1 month ago

Q u e s t i o n :After how many palces will the rational number 1251/125 terminate
A n s w e r :
1251 / 1250 = 1.0008

After 4 decimal places the rational number end.

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ANSWER

Find the zeroes of the polynomial 4X^2+3X+7 ?????

Posted by Dharani Vinayak 5 years, 1 month ago

CBSE > Class 10 > Mathematics

3 answers

Priyanshu ?✌??? 5 years, 1 month ago

4x^2+3x+7 =4x^2+7x-4x+7 =4x(x+7/4)-4(x+7/4) =(4x-4) or (x+7/4)=0 =x=1 or x=-7/4

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Manpreet Yadav 5 years, 1 month ago

1,-7/4

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Parth Gupta 5 years, 1 month ago

4x^2 +3x+7 (4x^2+4x)+(7x+7) 4x(x+1)+7(x+1) (4x+7)(x+1)

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ANSWER

Which of the following rational numbers have terminating decimal a)7/250b)16/225 c)5/18 d)2/21

Posted by Vaishnavi S 5 years, 1 month ago

CBSE > Class 10 > Mathematics

1 answers

Gaurav Seth 5 years, 1 month ago

(i) We have,

Theorem states:

Let be a rational number, such that the prime factorization of q is not of the form, where m and n are non-negative integers.

Then, x has a decimal expression which does not have terminating decimal.

(ii) We have,

Theorem states:

(iii) We have,

Theorem states:

(iv) We have,

Theorem states:

Let be a rational number, such that the prime factorization of q is of the form, where m and n are non-negative integers.

Then, x has a decimal expression which terminates after k places of decimals, where k is the larger of m and n.

Then, x has a decimal expression which will have terminating decimal after 3 places of decimal.

2Thank You

ANSWER

1(0) 453

Posted by Vishal Hanumanth 5 years, 1 month ago

CBSE > Class 10 > Mathematics

1 answers

Mk Sharma 5 years, 1 month ago

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ANSWER

Seven times a 2- digit no is equal to four times the number obtained by reversing the order of the digits if the difference of the digits is 3 . Find the number

Posted by Dharani Vinayak 5 years, 1 month ago

CBSE > Class 10 > Mathematics

1 answers

........ ...... 5 years, 1 month ago

Let the no at tenths place= x And the no at ones place=y :. the no will be (10x+y) A/Q 7(10x+y)=4(10y+x) 70x+7y=40y+4x 66x=33y x=y/2 Given the difference between them is 3. Since x is less then y-x=3 Put the value of x y-y/2=3 y=6 : . x=3 Hence, the original no is 36 and the reverse no is 63.

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