Question 93

Solve the following question:

Using distributive law, find the squares of
a) 101
b) 72

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Solution

a) We have, $101^{2} = 101 \times 101$
$= 101 (100 + 1) = 10100 + 101 = 10201$

b) We have, $72^{2} = 72 \times 72 = 72 \times (70 + 2)$
$= 5040 + 144 = 5184$

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