Ex 5.2, 1 Find the square of the following numbers. (iv) 93We know that
93 = 90 + 3
Now,
932 = 93 × 93
= (90 + 3) × (90 + 3)
= (90 + 3)2
= 902 + 32 + 2 × 90 × 3
= 8100 + 9 + 540
= 8649
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