Expand
A_{1}^{2}+2A_{1}B+B^{2}
Evaluate
\left(A_{1}+B\right)^{2}
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A_{1}^{2}+2A_{1}B+B^{2}
Use binomial theorem \left(a+b\right)^{2}=a^{2}+2ab+b^{2} to expand \left(A_{1}+B\right)^{2}.
A_{1}^{2}+2A_{1}B+B^{2}
Use binomial theorem \left(a+b\right)^{2}=a^{2}+2ab+b^{2} to expand \left(A_{1}+B\right)^{2}.
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