1.x×x-11x+28;
D=121-112=9;
x1=(11-3)/2=4
x2=(11+3)/2=7
2.(x×x+7x+12)/x×x-9=(7(x+3)(x+4))/(x-3)(x+3)=(7(x+4))/(x-3)
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Answers & Comments
1.x×x-11x+28;
D=121-112=9;
x1=(11-3)/2=4
x2=(11+3)/2=7
2.(x×x+7x+12)/x×x-9=(7(x+3)(x+4))/(x-3)(x+3)=(7(x+4))/(x-3)