Factor
\left(7a-4b\right)\left(3a+7b\right)
Evaluate
\left(7a-4b\right)\left(3a+7b\right)
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21a^{2}+37ba-28b^{2}
Consider 21a^{2}+37ab-28b^{2} as a polynomial over variable a.
\left(3a+7b\right)\left(7a-4b\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 -28b^{2}. One such factor is 3a+7b. Factor the polynomial by dividing it by this factor.
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