Question

resolver essa 5- (x+3) (x-1) = 2x + 8

Answer 1

Que sinal está entre  (x+3).......(x-1)?

Answer 2

5-(x-3)(x+1) = 2x+8
5-x²+x+3x+3-2x-8 = 0
5-x²+4x-2x+3-8 = 0
-x²+2x+3-8+5 = 0
-x²+2x = 0

x(-x+2x) = 0
x = 0  ou  -x-2 = 0
               -x = 2       .(-1)
               x = -2