CBSECBSE Class 8
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Using Identities, Evaluate 8.9square2 - Mathematics

Using identities, evaluate 8.92

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Solution

8.92 = (9.0 − 0.1)2

= (9.0)2 − 2(9.0) (0.1) + (0.1)2 [(a − b)2 = a2 − 2ab + b2 ]

= 81 − 1.8 + 0.01 = 79.21

Concept: Expansion of (a + b)2 = a2 + 2ab + b2
  Is there an error in this question or solution?
Chapter 9: Algebraic Expressions and Identities - Exercise 9.5 [Page 152]
Q 6.8
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NCERT Class 8 Maths Textbook
Chapter 9 Algebraic Expressions and Identities
Exercise 9.5 | Q 6.8 | Page 152
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