Question

Resolva :

a) (12+2x).(9+2x)

$b)\: \: (\: a {}^{2} + 2ab + b {}^{2}) \: - a {}^{2}$
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Answer 1

Explicação passo-a-passo:

$(12 + 2x).(9 + 2x) = 108 + 24x + 18x + 4x {}^{2} = 4x {}^{2} + 42x + 108$

$(a {}^{2} + 2ab + b {}^{2} ) - a {}^{2} = 2ab + b {}^{2}$