x^2-8x-9=0
D=b^2-4ac=64+36=100=10^2
x1=(8+10)/2=9;
x2=(8-10)/2=-1;
x^2-8x-9=(x-x1)(x-x2)=(x-9)(x+1)
Ответ: x^2-8x-9=(x-9)(x+1)
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x^2-8x-9=0
D=b^2-4ac=64+36=100=10^2
x1=(8+10)/2=9;
x2=(8-10)/2=-1;
x^2-8x-9=(x-x1)(x-x2)=(x-9)(x+1)
Ответ: x^2-8x-9=(x-9)(x+1)