Evaluate
\left(h+3\right)^{2}
Expand
h^{2}+6h+9
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\left(3+h\right)^{2}
Multiply 3+h and 3+h to get \left(3+h\right)^{2}.
9+6h+h^{2}
Use binomial theorem \left(a+b\right)^{2}=a^{2}+2ab+b^{2} to expand \left(3+h\right)^{2}.
\left(3+h\right)^{2}
Multiply 3+h and 3+h to get \left(3+h\right)^{2}.
9+6h+h^{2}
Use binomial theorem \left(a+b\right)^{2}=a^{2}+2ab+b^{2} to expand \left(3+h\right)^{2}.
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