Question

Find the square using (a+b)ki power 2 = a sq. +2ab+b sq.
A. 72
B. 89

Answer 1

Hope it will help you ☺️

Answer 2

A. 72 = (70+2) power 2
= (70)power 2 + 2(70)(2)+ (2)power 2
= 4900 + 280 + 4 = 5180 + 4 = 5184

B. 89 = (80+9) power 2
= (80) power 2 + 2(80)(9) + (9) power 2
= 1600 + 1440 + 81
= 1600 + 1521 = 3121

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