Question

respondam por favor!
(façam as contas)

dados os polinômios:
A=(3x²-5x-4)
B=(-9+7x-4x²)
C=(-12x+5-x²)

a.B-C=
b.A+B+C=
c.A-B-C=
d.A-C+B=

Answer 1

a) B-C
(-9+7x-4x²)-(-12x+5-x²)
-9+7x-4x²+12x-5+x²
-14+19x-3x²

b)A+B+C
(3x²-5x-4)+(-9+7x-4x²)+(-12x+5-x²)
3x²-5x-4-9+7x-4x²-12x+5+x²
-2x²-10x-8

c) A-B-C
(3x²-5x-4)-(-9+7x-4x²)-(-12x+5-x²)
3x²-5x-4+9-7x+4x²+12x-5+x²
8x²+0+0
8x²

d) A-C+B
3x²-5x-4+12x-5+x²-9+7x-4x²
0+14x-18
14x-18