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x²+x-2=?
x²+2x-3=?
x²-2x-8=?
x²-4x-12=?


Răspuns :

x²+2x-3= x²+3x-x-3= x(x-1)+3(x-1)= (x-1)(x+3)
x²-2x-8=x²-4x+2x-8= x(x+2)-4(x+2)=(x+2)(x-4)
x²-4x-12= x²-6x+2x-12= x(x+2)-6(x+2)=(x+2)(x-6)