Factor
\left(a-3b\right)\left(4a+5b\right)
Evaluate
\left(a-3b\right)\left(4a+5b\right)
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4a^{2}-7ba-15b^{2}
Consider 4a^{2}-7ab-15b^{2} as a polynomial over variable a.
\left(4a+5b\right)\left(a-3b\right)
Find one factor of the form ka^{m}+n, where ka^{m} divides the monomial with the highest power 4a^{2} and n divides the constant factor -15b^{2}. One such factor is 4a+5b. Factor the polynomial by dividing it by this factor.
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