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Question
Using distributive law, find the square of 72
Solution
Given: 72
As we know,
(72)2 is to find using distributive law:
722 = (70 + 2)2
= (70 + 2)(70 + 2)
= 70(70 + 2) + 2(70 + 2)
= ((70 × 70) + (70 × 2)) + ((2 × 70) + (2 × 2))
= 4900 + 140 + 140 + 4
= 5184
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