Question

Calcule os produtos:

A) (x+2).(x-1).(x+3)
B) (x+1).(x+3).(x-1)
C) (2-a).(1+a).(3-2a)
D) (x+1).(x-2).(x-3)
E) (x-2).(x-1).(x+3)
F) (x+1).(x+3).(x+1)
G) (2-a).(1+a).(3+2a)
50 pnts

Answer 1

a) (x+2)·(x-1)·(x+3) =
(x²-x+2x-2)(x+3)=
x³-x²+2x²-2x+3x²-3x+6x-6= 
x³+4x²+x-6 

b)(x+1)·(x+3)·(x-1) =
(x²+3x+x+3)(x-1)=
 x³+3x²+x²+3x-x²-3x-x-3=
x³+3x²-x-3

c) (2-a)·(1+a)·(3-2a) =
(2+2a-a-a²)(3-2a)=
6+6a-3a-3a²-4a-4a²+2a²+2a³=
2a³-5a²-a+6

Answer 2

A= 2x × -1x × 3x = -6x
B= 1x × 3x × -1x = -3x
C= -2a × 1a × 1a = -2a
D= 1x × -2x × -3x =+6x
E= -2x × -1x × 3x = +6x
F=1x × 3x × 1x = 3x
G= -2a × 1a × 5a = -10a