Factor
\left(x-7y\right)\left(x+13y\right)
Evaluate
\left(x-7y\right)\left(x+13y\right)
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x^{2}+6yx-91y^{2}
Consider x^{2}+6xy-91y^{2} as a polynomial over variable x.
\left(x+13y\right)\left(x-7y\right)
Find one factor of the form x^{k}+m, where x^{k} divides the monomial with the highest power x^{2} and m divides the constant factor -91y^{2}. One such factor is x+13y. Factor the polynomial by dividing it by this factor.
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