Question

( x + 4)² - ( x - 4)²

Answer 1

Oie, Td Bom?!

$= (x + 4) {}^{2} - (x - 4) {}^{2}$

$= (x + 4 - (x - 4)) \: . \: (x + 4 + x - 4)$

$= (x + 4 - (x - 4)) \: . \: (x + x)$

$= (x + 4 - x + 4) \: . \: (x + x)$

$= (x + 4 - x + 4) \: . \: 2x$

$= (4 + 4) \: . \: 2x$

$= 8 \: . \: 2x$

$= 16x$

Att. Makaveli1996