Factor
\left(3a-8b\right)\left(7a+9b\right)
Evaluate
\left(3a-8b\right)\left(7a+9b\right)
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21a^{2}-29ba-72b^{2}
Consider 21a^{2}-29ab-72b^{2} as a polynomial over variable a.
\left(3a-8b\right)\left(7a+9b\right)
Find one factor of the form ka^{m}+n, where ka^{m} divides the monomial with the highest power 21a^{2} and n divides the constant factor -72b^{2}. One such factor is 3a-8b. Factor the polynomial by dividing it by this factor.
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