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x^2+4x-12=0
(x-2)(x+6)=0
x1=2
x2=-6
2)
x (x-8)=33
x^2-8x=33
x^2-8x-33=0
(x-11)(x+3)=0
x1=11
x2=-3
3)
(x+1)(x-2)=18
x^2-2x+x-2=18
x^2-x-2-18=0
x^2-x-20=0
(x-5)(x+4)=0
x1=5
x2=-4