Respostas

  • Usuário do Brainly
2013-12-16T17:18:38-02:00
x(x-2)=8(x-1)
x
²-2x=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\}