Question

escreva as equação na forma geral e resolva x(x-2)=2(x+6)

Answer 1

x²-2x=2x+12
x²-4x-12=0

Δ=b²-4ac
Δ=(-4)² - 4 (1)(-12)
Δ=16+48
Δ= 64

x= -b+- √Δ /2a  x=4+-8/2
x'=12/2=6
x''=-4/2=-2