Question

resolva as equaçoes do 2 grau sendo x(x-2)=2(x+6)

Answer 1

x(x-2)=2(x+6)

x²-2x= 2x+12

x²-2x-2x-12=0

x²-4x-12

Answer 2

x(x-2)=2(x+6)
x²-2x=2x+12
x²-2x-2x-12=0
x²-4x-12=0
a=1
b=-4
c=-12
Δ=b²-4ac
Δ=(-4)²-4×1×(-12)
Δ=16+48
Δ=64

x=-b(+ou-)√Δ/2a
x=-(-4)(+ou-)√64/2×1
x=4(+ou-)8/2
x'=4+8/2
x'=12/2
x'=6

x"=4-8/2
x"=-4/2
x"=-2
 Bons estudos!!!