Question

VALENO 13 PTS CUBO DA SOMA


A) (5Y+2)³ B)(Y+4)³ C) (2X+Y)3

Answer 1

a) (5y +2 )³ 
(5y+2)² *(5y+2)
(25y² + 20y + 4) * (5y+2)
25y³ + 50y² + 100y² +40y + 20y +8
25y³ +150y² +60y + 8

b) (y+4)³
(y+4)² * (y+4)
(y² + 8y + 16) *(y+4)
y³ +4y² + 8y² + 32y + 16y + 64
y³ + 12y² + 48y + 64

c) (2x+y)³
(2x+y)² * (2x+y)
(4x² + 4xy + y²)* (2x+y)
8x³ + 4x²y + 8x²y + 4xy² + 2y²x + y³
8x³ + y³ +12x²y +8xy²