Evaluate
\left(a+2b+3\right)^{2}
Expand
a^{2}+4ab+6a+4b^{2}+12b+9
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a^{2}+4ab+6a+4b^{2}+12b+9
Square 3+a+2b.
a^{2}+4ab+6a+4b^{2}+12b+9
Square 3+a+2b.
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