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x^2+2x+1+2x+2-8=0
x^2+4x-5=0
(x+5)(x-1)
x=-5 atau x=1
2.(2x-3)^2 - 4(2x-3)-12=0
2x^2-12x+9-8x+12-12=0
2x^2-19x-x+9=0
2x^2-18x-x+9=0
2x(x-9)-1(x-9)=0
2x-1=0 atau x-9=0
2x=1 x=9
x=1/2