Question

Expand the following:
(2 + 7)²

Answer 1

${ \sf{ \large{(2 + 7)}^{2} }}$

${ \sf{ \large{ = {2}^{2} + 2.2.7} + {7}^{2} }}$

${ \sf{ \large{ = 4+ 28 + 49 }}}$

${ \sf{ \large{ = 81 }}}$

Answer 2

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Answer:

(2+7)² = (2)² + 2(2)(7) + (7)²

Using identity (a+b)² = a² + 2ab + b²

--> 4 + 28 + 49

--> 81