Evaluate
y\left(y+14\right)
Expand
y^{2}+14y
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y^{2}+14y+49-49
Use binomial theorem \left(a+b\right)^{2}=a^{2}+2ab+b^{2} to expand \left(y+7\right)^{2}.
y^{2}+14y
Subtract 49 from 49 to get 0.
y^{2}+14y+49-49
Use binomial theorem \left(a+b\right)^{2}=a^{2}+2ab+b^{2} to expand \left(y+7\right)^{2}.
y^{2}+14y
Subtract 49 from 49 to get 0.
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