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  • 1 answers

Sia ? 5 years, 10 months ago

Let the speed of train =x km/h and let the speed of bus =y km/h
According to given conditions,
60x+240y=4and100x+200y=4+1060
Let 1x=pand1y=q
Putting this in the above equations, we get
60p +240q =4 ........................... (1)
And100p +200q = 256 ............................. (2)
Multiplying (1) by 5 and (2) by 3, we get
300p +1200q = 20 ......................... (3)
300p +600q = 252......................... (4)
Subtracting (4) from (3), we get
600q =20− 252 =7.5 ⇒ q = 7.5600
Putting value of q in (2), we get
100p +200(7.5600)=256
⇒ 100p + 2.5 = 256
⇒ 100p = 256 - 2.5
⇒ p = 10600
But 1x=pand1y=q
Therefore, x = 60010=60 km/h and y = 6007.5 = 80km/h
Therefore, speed of train =60 km/h
And, speed of bus =80 km/h

  • 1 answers

Yash Tyagi 5 years, 11 months ago

Of what
  • 1 answers

Sia ? 5 years, 10 months ago

We have the polynomial f(x) = (3x4 - 15x3 + 13x2 + 25x - 30).
Since 53 and 53 are the zeros of f(x),
i.e., x=53 and x=53
i.e., x+53=0andx53=0 so  it follows that each
one of (x53)and(x+53) is a factor of f(x).so using (a+b)(ab)=a2b2, we get
(x53)(x+53)=0(x253)=0(3x25)3=0 is also a factor of f(x).
Consequently, (3x- 5) is a factor of f{x).
On dividing the polynomial by (3x2 - 5), we get

 f(x) = 3x4 - 15x3 + 13x2 + 25x - 30
= (3x- 5 )(x- 5x + 6).
By middle term factorisation. We get,
=(3x25)(x22x3x+6)
=([(3x)2(5)2][x(x2)3(x2)]
By using a2b2=(a+b)(ab)we get,
=(3x+5)(3x5)(x2)(x3)             
 f(x) = 0 , so either factors can equated to zero to get the roots (3x+5)=0 or (3x5)=0
(x - 2) = 0 or (x - 3) = 0
x=53 or x=53 or x = 2 or x = 3
Hence, we get all zeros of f(x) are 53,53, 2 and 3.

  • 3 answers

Akash Lal 5 years, 11 months ago

Can u please upload the solution please

Janu Likki 5 years, 11 months ago

72

Suniksha Bhatia 5 years, 11 months ago

70
  • 2 answers

Prince Raj 5 years, 11 months ago

Understood

Prince Raj 5 years, 11 months ago

Let the two positive odd integers be x=2m+1 and y=2n+1 where m and n is any positive integet because if a no. is multiplied by 2 it is even no. and then added by 1 then it changes to odd. ATQ x²+y²=(2m+1)²+(2n+1)² =4m²+1+4m+4n²+1+4n =4m²+4n²+4m+4n+2 =4(m²+n²+m+n)+2 Since the sum of square of any positive odd integar is always even And the unit digit of no. is 2 which is not fulfilled the divisibility rule of 4(the sum of the digits of the no.is divisible by 4 then the original no. is also perfectly divisible by 4Hence the square of x+y is even but not divisible by 4
  • 2 answers

Vaishali Wani 5 years, 10 months ago

Which?

Janu Likki 5 years, 11 months ago

By using formula
  • 2 answers

Mansi Sengar 5 years, 11 months ago

I want to know HCF linear combination in a simplest way

Akash Lal 5 years, 11 months ago

For exanple we have to find HCF of 20 and 12 so we first we convert them into its prime factors 20= 2×2×5 12=2×2×6 The highest common factor is 2×2. So its HCF is 4
  • 0 answers
  • 16 answers

Tanya Suryavanshi 5 years, 11 months ago

Thank u from the deep of the heart...and sorry for late answering

Pk . 5 years, 11 months ago

Anyway if you have doubt regardinga ny topic from any chapters . your are heartly welcome?️?️?️?️?️?️

Pk . 5 years, 11 months ago

You have to play with math, think about math, compare the event happening around with math.

Pk . 5 years, 11 months ago

Tanya if you really want to improve your math.then firstly you have to focus on calculation, as fast as your calculation math became as easy as bio( your favourite) ?????

Pk . 5 years, 11 months ago

Strongly welcome tanya

Tanya Suryavanshi 5 years, 11 months ago

If maths is ur veins...so plzz help me to understand it because i need someone who will teach me this..

Tanya Suryavanshi 5 years, 11 months ago

I like bio most...so i wants to chose basic

Pk . 5 years, 11 months ago

Mathematic is in my vain

Pk . 5 years, 11 months ago

Of standard label

Pk . 5 years, 11 months ago

I am going to choose mathematic

Tanya Suryavanshi 5 years, 11 months ago

Ok...so which option do u choose

Pk . 5 years, 11 months ago

Maine kaha na mere sis ne mera doubt clear kar diya

Pk . 5 years, 11 months ago

Tanya i have no doubt at all

Tanya Suryavanshi 5 years, 11 months ago

I'm also confused...so how could i clear ur doubt

Pk . 5 years, 11 months ago

I was also confused about it. But my sweet sis clear my doubt

Pk . 5 years, 11 months ago

Yes tanya the option basic or standard is for us class 10
  • 1 answers

?Niharika Sharma ? 5 years, 11 months ago

Whole chapters of all subjects except Social Science
  • 1 answers

Motivation Training 5 years, 11 months ago

an=a(n-1)d
  • 1 answers

Sia ? 5 years, 10 months ago

Since (3y1),(3y+5) and (5y+1) are in AP, we have
(3y+5)(3y1)=(5y+1)(3y+5)
 3y+53y+1=5y+13y5
 6=2y4
 2y=10
 y=5

  • 1 answers

Janu Likki 5 years, 11 months ago

The question itself is wrong a1x +b1y +c1=0 & a2x +b2y +c2 /_____/
  • 1 answers

__Richa Tiwari 5 years, 11 months ago

SinA 0°=0 30°=1/2 45°=1/√2 60°=√3/2 90°=1 we have learn only sin A value and all value learn eaisly cosA value opposite to sin A all value like cosA 0°=1 30°=√3/2 45° = 1/√2 60°= 1/2 90°=0 tanA all ratio find use sinA/cosAformula like tanA0°=sin0°/cos0° 0/1 = 0 so tanA0° is 0 similarly all tanA trignometric ratio find sinA/cosA tanA 30° = sin30°/cos30° 1/2/√3/2 = 1√3 tanA 45°= sin 45°/cos45°=1/√2/1/√2 = 1 tanA 60° = sin60°/cos60°=√3/2/1/2=√3 tanA 90°= sin90°/cos90° =1/0 = not define means soch ke bhar find cosecA trigonometric ratio use 1/sinA like cosecA 0° = 1/sin0°= 1/0= not define cosecA 30°= 1/sin30°=1/1/2=2 cosecA 45°=1/sin45°=1/1√2= √2 cosec60°=1/sin60°= 1/√3/2= 2/√3 cosec90°=1/sin90°= 1/1 = 1 secA opposite to cosecA like secA 0°= cosecA 90° secA 0°=1 secA 30°= cosecA 60° sec 30°= 2/√3 sec45°=cosec45° sec45°= √2 secA 60°= cosecA 30° secA 60°= 2 secA 90°= cosecA 0° sec90°= not define agr app iss mai confuse ho rhe ho to app ko yaad hoga sinA ka opposite cosecA hota h cosA ka opposite secA hota h hum cosA ko 1/secA likh skte h aise hi secA ko 1/cosA likh skte h 1/cosA ki value agr lagyege to hume secA ke all trignometric ratio pta chl jayege ab bacha cotA bhut easy h isme hum cosA/ sin A lga kar kr skte h ya fir 1/tanA lga kr . Isse hum easily yaad kr skte h sare ratio frnds bs hume sinA ke all trigonometric ratio yad hone chaiye baki hum formula lga kr skre kr skte h.????
  • 2 answers

__Richa Tiwari 5 years, 11 months ago

Sum= -1/4 product= 1/2 use formula make quadratic polynomial formula is x² - (sum of zeroes)x +(product of zeroes) putting the value x²- (-1/4)x + (1/2) ans ayega x² + 1/4+1/2. Fir hum multiply krege 4 se jisse divide ki value chali jaye like 4x²+ 4× 1/4 + 4×1/2 to humare pss equation ayegi 4x²+ x +2 ye humara quadratic polynomial banega

Nikhil Raj 5 years, 11 months ago

(a+b)=-1/4 (ab)=1/2 Putting the value of (a+b),(ab). P(x)=x2+( a +b)x-(ab) x2-1/4x-1/2 4x2-1x-2 hence the polynomial is 4x2-1x-2
  • 0 answers
  • 2 answers

Gaurav Seth 5 years, 11 months ago

A polynomial looks like this:

example of a polynomial
this one has 3 terms

Polynomial comes from <i>poly-</i> (meaning "many") and <i>-nomial</i> (in this case meaning "term") ... so it says "many terms"

A polynomial can have:

constants (like 3−20, or ½)
variables (like <i>x</i> and <i>y</i>)
exponents (like the 2 in y2), but only 0, 1, 2, 3, ... etc are allowed

Pk . 5 years, 11 months ago

Combination of constant and variable with +,-,×,÷ sign are polynomials
  • 1 answers

Sumit Sharma 5 years, 11 months ago

K(x2-(x+y)x +xy) K[x2-(2+(-6))x +(2*-6)] K[x2-(2-6)x +(-12)] K[x2-(-4)x -12] k[x2+4x-12] put k=1 Hence the polynomial is x2+4x-12
  • 1 answers

Janu Likki 5 years, 11 months ago

??????
  • 2 answers

__Richa Tiwari 5 years, 11 months ago

Isko prof krna h ya value nikalni hai

Ankit ?? Kumar 5 years, 11 months ago

1
  • 0 answers
  • 2 answers

Ankit ?? Kumar 5 years, 11 months ago

Together with only....

L K 5 years, 11 months ago

R.D sharma , Ncert ,Prabodh
  • 5 answers

Ankit ?? Kumar 5 years, 11 months ago

The 20th term of given ap is 81

Sarita Rajput 5 years, 11 months ago

a=5 :d=9-5=4 :an=81 : n=..? an=a+(n-1)d 81=5+(n-1)4 81-5=(n-1)4 76=(n-1)4 76/4= n-1 19 =n-1 19+1 =n n=20

Mayank Sharma 5 years, 11 months ago

a=5, d=9-5=4. an=81. an=a+(n-1)d. 81=5+(n-1)4. 81-5=(n-1)4. 76÷4=n-1. 19=n-1. 19+1=n. 20=n

Aadya Singh 5 years, 11 months ago

a = 5 , d = 9-5=4 , Tn=81 , n= ? AP of n th term is given by, Tn= a+ (n-1)d . Then, Tn = 5+(n-1)4 81= 5+4n-4 81+1=4n n= 82/4 n= 2.5 th term

Bhaskar .T 5 years, 11 months ago

An=a+(n-1)d 81=5+(n-1)4 81=5+4n-4 81=1+4n 81-1=4n 80=4n 80/4=n N=20
  • 0 answers

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