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Exercise

$4\left(x+4\right)\left(x-4\right)$

Step-by-step Solution

1

Aplicamos a regra: $\left(a+b\right)\left(a+c\right)$$=a^2-b^2$, onde $a=x$, $b=4$, $c=-4$, $a+c=x-4$ e $a+b=x+4$

$4\left(x^2-16\right)$

Final answer to the exercise

$4\left(x^2-16\right)$

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