Evaluate
\left(d+f\right)^{2}
Expand
d^{2}+2df+f^{2}
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\left(d+f\right)^{2}
Multiply d+f and d+f to get \left(d+f\right)^{2}.
d^{2}+2df+f^{2}
Use binomial theorem \left(a+b\right)^{2}=a^{2}+2ab+b^{2} to expand \left(d+f\right)^{2}.
\left(d+f\right)^{2}
Multiply d+f and d+f to get \left(d+f\right)^{2}.
d^{2}+2df+f^{2}
Use binomial theorem \left(a+b\right)^{2}=a^{2}+2ab+b^{2} to expand \left(d+f\right)^{2}.
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