Question

by using the formula ( a-b)2=(a2-2ab+b2) evaluate (196)2 .........{the "2" are the sign of squares ..}

Answer 1

(a - b)² = a² - 2ab + b²

196 is 200-4 so let a=200 and b=4.

(200 - 4)² = 200² - 2·200·4 + (-4)²

→ 40000 - 1600 + 16 = 38400 + 16 = 38416

Now, the answer is 38416.