Factor
\left(a-4b\right)\left(a+9b\right)
Evaluate
\left(a-4b\right)\left(a+9b\right)
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a^{2}+5ba-36b^{2}
Consider a^{2}+5ab-36b^{2} as a polynomial over variable a.
\left(a+9b\right)\left(a-4b\right)
Find one factor of the form a^{k}+m, where a^{k} divides the monomial with the highest power a^{2} and m divides the constant factor -36b^{2}. One such factor is a+9b. Factor the polynomial by dividing it by this factor.
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