Evaluate
-2a^{3}+\left(a-2\right)^{2}+a
Expand
4-3a+a^{2}-2a^{3}
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a^{2}-4a+4-2a^{3}+a
Use binomial theorem \left(p-q\right)^{2}=p^{2}-2pq+q^{2} to expand \left(a-2\right)^{2}.
a^{2}-3a+4-2a^{3}
Combine -4a and a to get -3a.
a^{2}-4a+4-2a^{3}+a
Use binomial theorem \left(p-q\right)^{2}=p^{2}-2pq+q^{2} to expand \left(a-2\right)^{2}.
a^{2}-3a+4-2a^{3}
Combine -4a and a to get -3a.
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