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RD Chapter 4- Algebraic Identities Ex-VSAQS Interview Questions Answers

Question 1 :

Answer 1 :


Question 2 :

Answer 2 :


Question 3 : If a + b = 7 and ab = 12, find the value of a2 + b2.

Answer 3 :

a + b = 7, ab = 12
Squaring both sides,
(a + b)2 = (7)2
 a2 + b2 + 2ab = 49
 a2 + b2 + 2 x 12 = 49
a2 +b2 + 24 = 49
a2 +b2 = 49 – 24 = 25
a2 +b2 = 25

Question 4 : If a – b = 5 and ab = 12, find the value of a2 + b2 .

Answer 4 :

a – b = 5, ab = 12
Squaring both sides,
(a –b)= (5)2
 a2 + b2 – 2ab = 25
 a2 + b2 – 2 x 12 = 25
 a2 + b2 – 24 = 25
 a2 + b2 = 25 + 24 = 49
a2 +b2 = 49

Question 5 :

Answer 5 :


Question 6 :

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Question 7 :

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