Evaluate
k\left(2m+k\right)
Expand
2km+k^{2}
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m^{2}+2mk+k^{2}-m^{2}
Use binomial theorem \left(a+b\right)^{2}=a^{2}+2ab+b^{2} to expand \left(m+k\right)^{2}.
2mk+k^{2}
Combine m^{2} and -m^{2} to get 0.
m^{2}+2mk+k^{2}-m^{2}
Use binomial theorem \left(a+b\right)^{2}=a^{2}+2ab+b^{2} to expand \left(m+k\right)^{2}.
2mk+k^{2}
Combine m^{2} and -m^{2} to get 0.
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