Question

1) EFETUE AS MULTIPLICAÇOES:
A) (a+5).(a²+3a+2)
B) (x²-x+3).(x²-4x+1)
C) (3x-y).(x+y-2)
D) (x²-2x+1)²
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Answer 1

a)(a+5)(a2+3a+2)
a(a2+3a+2)+5((a2+3a+2)
a3+3a2+2a+5a2+15a+10
a3+3a2+5a2+2a+15a+10
a3+8a2+17a+10
b) (x2-x+3)(x2-4x+1)
x2(x2-4x+1)-x(x2-4x+1)+3(x2-4x+1)
x4-4x3+x2-x3+4x2-x+3x2-12x+3
x4-4x3-x3+x2+4x2+3x2-x-12x+3
x4-5x3+9x2-13x+3
c)(3x-y)(x+y-2)
3x(x+y-2)-y(x+y-2)
3x2+3xy-6x-xy-y2+2y
3x2+3xy-xy-6x-y2+2y
3x2+2xy-6x-y2+2y
d)(x2-2x+1)2
x4-4x2+1