Question

Me ajudem a responder essa questão!! 

x(x-2)=8(x-1)

Answer 1

x(x-2)=8(x-1)
x²-2x=8x-8
x²-2x-8x+8=0
x²-10x+8=0
Δ=(-10)²-4.1.8
Δ=100-32
Δ=68
$x= \frac{10+- \sqrt{68}}{2.1}\\\\ x= \frac{10+-8}{2}\\\\ x'= \frac{10+8}{2}\\\\ x'= \frac{18}{2}\\\\ x'=9\\\\ x"= \frac{10-8}{2}\\\\ x"= \frac{2}{2}\\\\ x"=1\\\\ V=\{9,1\}$