Factor
\frac{\left(-3m-28\right)\left(3m-28\right)}{16}
Evaluate
-\frac{9m^{2}}{16}+49
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\frac{784-9m^{2}}{16}
Factor out \frac{1}{16}.
\left(28-3m\right)\left(28+3m\right)
Consider 784-9m^{2}. Rewrite 784-9m^{2} as 28^{2}-\left(3m\right)^{2}. The difference of squares can be factored using the rule: a^{2}-b^{2}=\left(a-b\right)\left(a+b\right).
\left(-3m+28\right)\left(3m+28\right)
Reorder the terms.
\frac{\left(-3m+28\right)\left(3m+28\right)}{16}
Rewrite the complete factored expression.
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