Question

Sendo A=4x2-5x+12,B=2x+1 e C=5x2-1 calcule a)A+B+C= b)A-B-C= ?

Answer 1

A) Calcule 4x.2-5x+12+2x+1+5x.2-1
8x-3+12+10x
5x+12+10x
15x+12
3(5x+4)
B) Calcule 4x.2-5x+12-2x+1-5x.2-1
8x-7x+12-10x
X+12-10x
-9x+12
-3(3x-4)

OBS: O . E A MESMA COISA DE VEZES