Use the Product (A + B) (A – B) = A2 – B2 to Evaluate: 103 X 97 - Mathematics

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Sum

Use the product (a + b) (a – b) = a2 – b2 to evaluate:
103 x 97

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Solution

103 x 97 = (100+3) (100−3)

= (100)2 − (3)2

= 10000 − 9

= 9991

Concept: Product of Sum and Difference of Two Terms
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APPEARS IN

Selina Concise Mathematics Class 8 ICSE
Chapter 12 Identities
Exercise 12 (A) | Q 4.3 | Page 150
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