Question

Dados os polinômios A = 3x2 + 2x – 4, B = 5x – 3 e C = 2x + 5, calcule:

a) A + B + C b) AB – BC
c) A2 - 2B

Answer 1

A) 15X - 7

3X2+2X-4+5X-3+2X=
6X+9X-3-4= 
15X-7

B)10X²+30X-12

[(3X2+2X-4) (5X-3)]-[2X(5X-3)] = 
(8X+4)(5X-3)] -[ 10X²-6X]=
40X-24X+20X-12 - 1OX²-6X=
10X²+30X-12



C) 6X-2 

2(3X2+2X-4) -2(5X-3)=
12X+4X-8-10X+6=
2X+4X-8+6=
6X-2