Question

1) calcule

a) (x+1)³
b) (3a-2)³

Answer 1

a) (x+1)*(x+1)*(X+1)=
 ($x^{2} -2x +1) *(x + 1) = x^{3} + 3 x^{2} + 3x -1$ (resposta da a)


b) (3a-2) * (3a-2) * (3a-2)
9a-6a+4 * (3a-2)
27a-18a-8=
9a-8(pode parar por aqui , eu acho)

9a-8=0 (iguala a 0)
9a=0+8
9a=8
a=8-9
a= -1

Answer 2

1) calcule

a) (x+1)³

x³ + 3.x².1 + 3.x.1² + 1³ ==>  x³ + 3x² + 3x + 1 ==================================================
b) (3a-2)³

(3a)³ + 3.(3a)².(-2) + 3.(3a).(-2)² + (-2)³ ==> 27a³ - 54a² + 36ax - 8