CBSECBSE Class 8
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Using Identities, Evaluate 71square2 - Mathematics

Using identities, evaluate 712

 

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Solution

712 = (70 + 1)2

= (70)2 + 2(70) (1) + (1)2 [(a + b)2 = a2 + 2ab + b2 ]

= 4900 + 140 + 1 = 5041

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 6.1
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APPEARS IN

NCERT Class 8 Maths Textbook
Chapter 9 Algebraic Expressions and Identities
Exercise 9.5 | Q 6.1 | Page 152
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