Evaluate
5\left(5-3a\right)\left(a+1\right)
Expand
25+10a-15a^{2}
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a^{2}+10a+25-16a^{2}
Use binomial theorem \left(p+q\right)^{2}=p^{2}+2pq+q^{2} to expand \left(a+5\right)^{2}.
-15a^{2}+10a+25
Combine a^{2} and -16a^{2} to get -15a^{2}.
a^{2}+10a+25-16a^{2}
Use binomial theorem \left(p+q\right)^{2}=p^{2}+2pq+q^{2} to expand \left(a+5\right)^{2}.
-15a^{2}+10a+25
Combine a^{2} and -16a^{2} to get -15a^{2}.
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