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a^{2}+2ab+b^{2}+9\left(a+b\right)-10
Use binomial theorem \left(p+q\right)^{2}=p^{2}+2pq+q^{2} to expand \left(a+b\right)^{2}.
a^{2}+2ab+b^{2}+9a+9b-10
Use the distributive property to multiply 9 by a+b.
a^{2}+2ab+b^{2}+9\left(a+b\right)-10
Use binomial theorem \left(p+q\right)^{2}=p^{2}+2pq+q^{2} to expand \left(a+b\right)^{2}.
a^{2}+2ab+b^{2}+9a+9b-10
Use the distributive property to multiply 9 by a+b.