Ex 5.2, 1 Find the square of the following numbers. (ii) 35We know that
35 = 30 + 5
Now,
352 = 35 × 35
= (30 + 5) × (30 + 5)
= (30 + 5)2
= 302 + 52 + 2 × 30 × 5
= 900 + 25 + 300
= 1225
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