Factor
\frac{\left(21a-10b\right)\left(21a+10b\right)}{196}
Evaluate
\frac{9a^{2}}{4}-\frac{25b^{2}}{49}
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\frac{441a^{2}-100b^{2}}{196}
Factor out \frac{1}{196}.
\left(21a-10b\right)\left(21a+10b\right)
Consider 441a^{2}-100b^{2}. Rewrite 441a^{2}-100b^{2} as \left(21a\right)^{2}-\left(10b\right)^{2}. The difference of squares can be factored using the rule: p^{2}-q^{2}=\left(p-q\right)\left(p+q\right).
\frac{\left(21a-10b\right)\left(21a+10b\right)}{196}
Rewrite the complete factored expression.
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