Factor
\left(3x-y\right)\left(3x-13y\right)
Evaluate
\left(3x-y\right)\left(3x-13y\right)
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9x^{2}-42yx+13y^{2}
Consider 9x^{2}-42xy+13y^{2} as a polynomial over variable x.
\left(3x-13y\right)\left(3x-y\right)
Find one factor of the form kx^{m}+n, where kx^{m} divides the monomial with the highest power 9x^{2} and n divides the constant factor 13y^{2}. One such factor is 3x-13y. Factor the polynomial by dividing it by this factor.
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