Question

Simplifique a expressão: 5x – ( 2x + 3)²

Answer 1

Oie, Td Bom?!

$= 5x - (2x + 3) {}^{2}$

$= 5x - ((2x) {}^{2} + 2 \: . \: 2x \: . \: 3 + 3 {}^{2} )$

$= 5x - (4x {}^{2} + 12x + 9)$

$= 5x - 4x {}^{2} - 12x - 9$

$= - 7x - 4x {}^{2} - 9$

$= - 4x {}^{2} - 7x - 9$

Att. Makaveli1996