Evaluate
-81p^{4}+\left(3p+2q\right)^{2}
Expand
4q^{2}+12pq+9p^{2}-81p^{4}
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9p^{2}+12pq+4q^{2}-81p^{4}
Use binomial theorem \left(a+b\right)^{2}=a^{2}+2ab+b^{2} to expand \left(3p+2q\right)^{2}.
9p^{2}+12pq+4q^{2}-81p^{4}
Use binomial theorem \left(a+b\right)^{2}=a^{2}+2ab+b^{2} to expand \left(3p+2q\right)^{2}.
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