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If the 11^( th ) term of an A.P.is - 21 and the sum of first 7 terms is -49 find the A.P

Posted by Good Student 5 years, 2 months ago

CBSE > Class 10 > Mathematics

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3.6 by elemation method only 1st beet 2 questions

Posted by Vinayak Vk 5 years, 2 months ago

CBSE > Class 10 > Mathematics

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Solve the following pair of linear equation by substitution method Q1 x+ y= 14

Posted by Vinayak Vk 5 years, 2 months ago

CBSE > Class 10 > Mathematics

3 answers

Aakanksha Uppal 5 years, 2 months ago

Equation is incomplete....

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Rashmi Priyqdarshnj 4 years, 11 months ago

Provide the other equation

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Sanjana R 5 years, 2 months ago

Where is one more eq.

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6 prove that questions from triknomatry

Posted by Ameera V.R 5 years, 2 months ago

CBSE > Class 10 > Mathematics

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I need examples of chapter 8

Posted by Rakshit Keswani 5 years, 2 months ago

CBSE > Class 10 > Mathematics

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What is the important question of chapter 8 [ Trigonometry] and chapter 13 [volume and surface area] ??

Posted by Shubham Saxena ???? 5 years, 2 months ago

CBSE > Class 10 > Mathematics

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Find the quadratic polynomial whose sum and product of zeros are 21/8 and 5/16 respectively

Posted by Khushpreet Kaur 5 years, 2 months ago

CBSE > Class 10 > Mathematics

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Tell me the important question of chapter 8 [ Trigonometry] and chapter 13 [ volume and surface area ]. ??

Posted by Shubham Saxena ???? 5 years, 2 months ago

CBSE > Class 10 > Mathematics

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√5is irrational prove that

Posted by Siyanshu ??? 5 years, 2 months ago

CBSE > Class 10 > Mathematics

1 answers

Shubham Saxena ???? 5 years, 2 months ago

Let us assume that √5 is a rational number. Sp it t can be expressed in the form p/q where p,q are co-prime integers and q≠0 ⇒√5=p/q On squaring both the sides we get, ⇒5=p²/q² ⇒5q²=p² —————–(i) p²/5= q² So 5 divides p p is a multiple of 5 ⇒p=5m ⇒p²=25m² ————-(ii) From equations (i) and (ii), we get, 5q²=25m² ⇒q²=5m² ⇒q² is a multiple of 5 ⇒q is a multiple of 5 Hence, p,q have a common factor 5. This contradicts our assumption that they are co-primes. Therefore, p/q is not a rational number √5 is an irrational number

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In triangle ABC, B = 90° , and sin A =3/4 , then show that cosA + sinC = root 7/2 . Give me the answer of my question.

Posted by Shubham Saxena ???? 5 years, 2 months ago

CBSE > Class 10 > Mathematics

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In triangle ABC, angle B = 90° , If sinA = 3/4 , then show that cosA + sinC = root 7 /2 ??

Posted by Shubham Saxena ???? 5 years, 2 months ago

CBSE > Class 10 > Mathematics

3 answers

Sanjana R 5 years, 2 months ago

Welcome

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Shubham Saxena ???? 5 years, 2 months ago

Ok thanks for answering my question.

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Sanjana R 5 years, 2 months ago

Given that sinA=3/4 =opp/hyp =3x/4x By using Pythagoras theorem find adj of angle A U will get x root 7 By using this information find sinC and cosA. U will get 2 root 7 / 4. If u simplify further u will get root 7 / 2

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In the fig angle a is 90 deg ad perpinduclar bc bd 2 cm and CD 8 cm find ad

Posted by Samyak Jain 5 years, 2 months ago

CBSE > Class 10 > Mathematics

0 answers

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How to find zeroes of cubic polynomial

Posted by Nishu Raj 5 years, 2 months ago

CBSE > Class 10 > Mathematics

2 answers

Neha Rajput 5 years, 2 months ago

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Yogesh Patel 5 years, 2 months ago

https://youtu.be/s1SN5eD0xTA

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1+CosA/sinA=sinA/1-cosA

Posted by Viplav Singh 5 years, 2 months ago

CBSE > Class 10 > Mathematics

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Sec2a+ tan2a=1 find a

Posted by Anant Srivastava 5 years, 2 months ago

CBSE > Class 10 > Mathematics

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if a and b are the points -6,-7 and -1 , -5 respectively than what is distance 2ab

Posted by Raghuvendra Shekawat 5 years, 2 months ago

CBSE > Class 10 > Mathematics

1 answers

Piyush Rajpoot 5 years, 2 months ago

Root 29

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Ex 12.1 1 number question full solution

Posted by Ganesh Kumar Singh 5 years, 2 months ago

CBSE > Class 10 > Mathematics

1 answers

Vinayak Vk 5 years, 2 months ago

Go to you tube channel name is green board full perfect explainnation is there

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Q no. 1 of ch 9 of class 10

Posted by Sachin Pal 5 years, 2 months ago

CBSE > Class 10 > Mathematics

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If 7sin square theta plus cos square theta is equal to 44.Show that tan theta is equal to 1 by root 3

Posted by Sadia Sonu 5 years, 2 months ago

CBSE > Class 10 > Mathematics

1 answers

Tuplal Tuplal Pandit 5 years, 2 months ago

Solve it

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Is ncert exemplar is important for board exams?

Posted by Tanu Man 5 years, 2 months ago

CBSE > Class 10 > Mathematics

3 answers

Dhruv Jha 5 years, 2 months ago

Yes it's very important

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Satyam Roy 5 years, 2 months ago

Yes to is necessary because you can see in CBSE book list of 2021 that prescribed books are ncert and ncert exemplar ( only maths and science ) . So buy them because 30 percent questions will come from them in board exams .???

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Tanu Man 5 years, 2 months ago

Or only ncert is enough

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Given - In triangle ABC ,, B = 90° ,, If 15 cot A = B ,, find sin A and sec A ??

Posted by Shubham Saxena ???? 5 years, 2 months ago

CBSE > Class 10 > Mathematics

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9 to the power n - 5 to the power n ends with what digit

Posted by Jyotirmay Paul 5 years, 2 months ago

CBSE > Class 10 > Mathematics

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root 3cos 13 degree +sun 13degree=2sin73 degree

Posted by Manisha Ahlawat 5 years, 2 months ago

CBSE > Class 10 > Mathematics

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Find the coordinats of the points which Davide the join (-1)and(4-5)in the ratio of 2:3

Posted by Sourav Ludhiana 5 years, 2 months ago

CBSE > Class 10 > Mathematics

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A die is tossed twice. What is the probability of getting sum of numbers 12 ?

Posted by Sumit Kumar 5 years, 2 months ago

CBSE > Class 10 > Mathematics

4 answers

Habiba Rangoonwala 5 years, 2 months ago

1/36

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Saurabh ???? 5 years, 2 months ago

1/36

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Harsh Dalvi 5 years, 2 months ago

1/36

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Tanu Man 5 years, 2 months ago

No. of favourable outcomes= 1 i.e. (6,6) Total no. of outcomes =36 P( sum of numbers 12) = 1/36

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The hcf of 198 and 44

Posted by Aryan Khatana 5 years, 2 months ago

CBSE > Class 10 > Mathematics

3 answers

Saurabh ???? 5 years, 2 months ago

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Åsthå Åsthå 5 years, 2 months ago

Hcf =22

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Shubham Saxena ???? 5 years, 2 months ago

= 198 = 44 × 4 + 22 ,, = 44 = 22 × 2 + 0 ,, Hence ,, the HCF of 198 and 44 is 22. Thank you ,, Shubham Saxena

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The value of x

Posted by Aryan Khatana 5 years, 2 months ago

CBSE > Class 10 > Mathematics

1 answers

Shubham Saxena ???? 5 years, 2 months ago

Where is a question for finding the value of x

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If one of the zeroes of the quadratic polynomial (k – 1) x² + kx + 1 is – 3, then the value of k is

Posted by K.Bhargav Baalaji 5 years, 2 months ago

CBSE > Class 10 > Mathematics

1 answers

Panjwani Vishwas 5 years, 2 months ago

Substitute X=-3 K-1*9-3k+1=0 6k=8 K=4\3

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if into triangle sides of triangle are proportional to the sides of other triangle than their corresponding angles are equal and hence the two triangles are similar

Posted by Anushka Sharma 5 years, 2 months ago

CBSE > Class 10 > Mathematics

2 answers

Shubham Saxena ???? 5 years, 2 months ago

Construction: Two triangles ABC and DEF are drawn so that their corresponding sides are proportional. This means: ABDE=ACDF=BCEFABDE=ACDF=BCEF To Prove: ∠ A = ∠ D, ∠ B = ∠ E and ∠ C = ∠ F And hence; Δ ABC ∼ Δ DEF In triangle DEF, draw a line PQ so that DP = AB and DQ = AC Proof: ΔABC≅ΔDPQΔABC≅ΔDPQ Because corresponding sides of these two triangles are equal This means; DPPE=DQQF=PQEFDPPE=DQQF=PQEF This also means; ∠ P = ∠ E and ∠ Q = ∠ F We have taken; ∠ A = ∠ D, ∠ B = ∠ P and ∠ C = ∠ Q Hence; ∠ A = ∠ D, ∠ B = ∠ E and ∠ C = ∠ F From AAA criterion; Δ ABC ∼ Δ DEF proved Hence ,, two triangles are equal . Thank you..

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Anushka Sharma 5 years, 2 months ago

Give me the answer of this question

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If the 11^( th ) term of an A.P.is - 21 and the sum of first 7 terms is -49 find the A.P

Posted by Good Student 5 years, 2 months ago

CBSE > Class 10 > Mathematics

2 answers

Sahil Kumar 5 years, 2 months ago

11th term=a+(11-1)d=(-21) a+10d=(-21) a=(-21-10d) Sum of first 7th term =7/2(2×a+(7-1)(d) =7(a+3d) =7(-21-10d+3d) =7(-21-7d) =49(-3-d) But,49(-3-d)=(-49) -3-d=(-1) d=(-2) a=-21-10(-2)=(-1) AP=(-1),(-3),(-5).......

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Salman Khan 5 years, 2 months ago

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