Evaluate
-\left(7c-5\right)\left(c+5\right)
Expand
25-30c-7c^{2}
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9c^{2}-30c+25-16c^{2}
Use binomial theorem \left(a-b\right)^{2}=a^{2}-2ab+b^{2} to expand \left(3c-5\right)^{2}.
-7c^{2}-30c+25
Combine 9c^{2} and -16c^{2} to get -7c^{2}.
9c^{2}-30c+25-16c^{2}
Use binomial theorem \left(a-b\right)^{2}=a^{2}-2ab+b^{2} to expand \left(3c-5\right)^{2}.
-7c^{2}-30c+25
Combine 9c^{2} and -16c^{2} to get -7c^{2}.
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