Advertisements
Advertisements
Question
Using suitable identities, evaluate the following.
(9.9)2
Evaluate
Advertisements
Solution
We have,
(9.9)2 = (10 – 0.1)2
= 102 + (0.1)2 – 2 × 10 × 0.1 ...[Using the identity, (a – b)2 = a2 + b2 – 2ab]
= 100 + 0.01 – 2
= 98.01
shaalaa.com
Is there an error in this question or solution?
Chapter 7: Algebraic Expression, Identities and Factorisation - Exercise [Page 233]
APPEARS IN
RELATED QUESTIONS
Expand: (5x - 4)2
(p – q)2 = _______________
Factorise the following using suitable identity
x2 – 8x + 16
Simplify: (a + b)2 – (a – b)2
(a – b)2 + ______ = a2 – b2
Factorise the following, using the identity a2 – 2ab + b2 = (a – b)2.
x2 – 10x + 25
Factorise the following, using the identity a2 – 2ab + b2 = (a – b)2.
p2 – 2p + 1
Factorise the following.
y2 + 4y – 21
If x – y = 13 and xy = 28, then find x2 + y2.
If `x - 1/x = 7` then find the value of `x^2 + 1/x^2`.
