Evaluate
9\left(a+b\right)^{18}
Expand
9a^{18}+393822a^{8}b^{10}+286416a^{7}b^{11}+167076a^{6}b^{12}+77112a^{5}b^{13}+27540a^{4}b^{14}+7344a^{3}b^{15}+1377a^{2}b^{16}+162ab^{17}+9b^{18}+393822b^{8}a^{10}+286416b^{7}a^{11}+167076b^{6}a^{12}+77112b^{5}a^{13}+27540b^{4}a^{14}+7344b^{3}a^{15}+1377b^{2}a^{16}+162ba^{17}+437580\left(ab\right)^{9}
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