Factor
\left(2c-7\right)\left(2c+7\right)
Evaluate
4c^{2}-49
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4c^{2}-49
Multiply and combine like terms.
\left(2c-7\right)\left(2c+7\right)
Rewrite 4c^{2}-49 as \left(2c\right)^{2}-7^{2}. The difference of squares can be factored using the rule: a^{2}-b^{2}=\left(a-b\right)\left(a+b\right).
4c^{2}-49
Combine 14c and -14c to get 0.
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Limits
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