a ^ { 3 } - a ^ { 2 } b \text { restar } 7 a ^ { 2 } b + 9 a b ^ { 2 }
Factor
a\left(-7b^{2}a^{3}\left(-Im(s)\left(Re(t)\left(Re(a)Im(r)+Re(r)Im(a)\right)+Im(t)\left(Re(a)Re(r)-Im(a)Im(r)\right)\right)+Re(s)\left(-Im(t)\left(Re(a)Im(r)+Re(r)Im(a)\right)+Re(t)\left(Re(a)Re(r)-Im(a)Im(r)\right)\right)\right)+9b^{2}+a^{2}\right)
Evaluate
a\left(-7b^{2}a^{3}\left(-Im(s)\left(Re(t)\left(Re(a)Im(r)+Re(r)Im(a)\right)+Im(t)\left(Re(a)Re(r)-Im(a)Im(r)\right)\right)+Re(s)\left(-Im(t)\left(Re(a)Im(r)+Re(r)Im(a)\right)+Re(t)\left(Re(a)Re(r)-Im(a)Im(r)\right)\right)\right)+9b^{2}+a^{2}\right)
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a\left(a^{2}-7abRe(star)a^{2}b+9b^{2}\right)
Factor out a.
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