x²-x-72=0
x²+8x-9x-72=0;
x×(x+8)-9(x+8)=0;
(x+8)×(x-9)=0;
x+8=0
x-9=0;
x=-8
x=9;
x1=-8, x2=9
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x²-x-72=0
x²+8x-9x-72=0;
x×(x+8)-9(x+8)=0;
(x+8)×(x-9)=0;
x+8=0
x-9=0;
x=-8
x=9;
x1=-8, x2=9