Question

calcule as raizes (x-4) (x+8) =4 (x+8)

Answer 1

(x-4).(x+8)=4.(x+8)
x²+8x-4x-32=4x+32
x²+4x-32-4x-32=0
x²-64=0
x²=64
x=√64
x=+-8