Question

(5 + 2x)*2 podem me ajudar a resolver?
(3x – 1)*2

Answer 1

Oie, Td Bom?!

I.

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

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

$= 25 + 20x + 4x {}^{2}$

$= 4x {}^{2} + 20x + 25$

II.

$= (3x - 1) {}^{2}$

$= (3x) {}^{2} - 2 \: . \: 3x \: . \: 1 + 1 {}^{2}$

$= 9x {}^{2} - 6x + 1$

Att. Makaveli1996