Question

2x(4x-2)-4=0



x(x+1)=30

Answer 1

2x(4x-2)-4
8x^2-4x-4=0
delta=b^2-4ac
delta=(-4)^2-4.8.(-4)
delta=16+128
delta=144
x=-b-/+ raiz de delta/2a
x=-(-4)-12/2.8
x=4-12/16
x=-8/16 (:8)
x=-1/2
x=-(-4)+12/2.8
x=4+12/16
x=16/16
x=1
x(x+1)=30
x^2+x=30
x^2+x-30=0
delta=b^2-4ac
delta=1^2-4.1.(-30)
delta=1+120
delta=121
x=-b-/+ raiz de delta/2a
x=-1-11/2.1
x=-12/2
x=-6
x=-1+11/2.1
x=10/2
x=5

Answer 2

2x.4x=8 2x.-2x=-4 -4 - 8 -8 =0