Evaluate
-18p^{2}+18pq-q^{2}-14q
Differentiate w.r.t. p
18\left(q-2p\right)
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-12p^{2}+5pq-14q-6p^{2}+13pq-q^{2}
Multiply q and q to get q^{2}.
-18p^{2}+5pq-14q+13pq-q^{2}
Combine -12p^{2} and -6p^{2} to get -18p^{2}.
-18p^{2}+18pq-14q-q^{2}
Combine 5pq and 13pq to get 18pq.
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