Find the squares of. (i) 85 (ii) 115 (iii) 165 – InterviewSolution

1.

Find the squares of. (i) 85 (ii) 115 (iii) 165

Answer»

(i) 85² = (80 + 5)²

= 80² + 2 × 80 × 5 + 5²

= 6400 + 800 + 25 = 7225

(ii) 115² = ( 100 + 15)²

= 100² + 2 × 100 × 15 + 15²

= 10,000 + 3000 + 225 = 13225

(iii) 165²=( 150+15)²

= 150² + 2 × 150 × 15 + 15²

= 22500 + 4500 + 225 = 27225

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