NCERT Solutions for Class 8 Mathematics Chapter 9
Important NCERT Questions
Algebraic Expressions and Identities Chapter 9 Exercise 9.5
NCERT Books for Session 2022-2023
CBSE Board
Questions No: 6
Using identities, evaluate: (i) 71² (ii) 99 ²
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2ND one will be 9018
(i) 71² = (70+1)² = (70)² +2x70x1+(1)²
[Using identity(a+b)²=a²-2ab+b²
= 4900 + 140 + 1 = 5041
(ii) 99² = (70)²+2x70x1+(1)²
[Using identity(a+b)²=a²-2ab+b²
= 10000 – 200 + 1 = 9801
Class 8 Maths Chapter 9 Exercise 9.5 Solution in Video
for more answers vist to:
https://www.tiwariacademy.com/ncert-solutions/class-8/maths/chapter-9/