Question

3) utilizando a rega pratica, resolva a diferença do cubo de dois termos. a³-3*a²*b+3*a*b²-b³Resolva (6x-4y)³ 1 ponto a) 216- 720xy-4y³ b) 216+ 720x²y-4y³ c) 216- 720x²y-4y³

Answer 1

Oie, Td Bom?!

>>> Resposta: Nenhuma das alternativas (Reveja o gabarito).

$= (6x - 4y) {}^{3}$

$= (6x) {}^{3} - 3 \: . \: (6x) {}^{2} \: . \: 4y + 3 \: . \: 6x \: . \: (4y) {}^{2} - (4y) {}^{3}$

$= 216x {}^{3} - 3 \: . \: 36x {}^{2} \: . \: 4y + 3 \: . \: 6x \: . \: 16y {}^{2} - 64y {}^{3}$

$= 216x {}^{3} - 432x {}^{2} y + 288xy {}^{2} - 64y {}^{3}$

Att. Makaveli1996

Answer 2

Olá!!

(6x-4y)³=

(6x)³-3.(6x)².4y+3.6x.(4y)²-(4y)³

216x³-3.36x.4y+18x.16y-64y³=

216x³-432x²y+288xy²-64y³

Att=Gauzz