Expand
y^{2}+3y+9
Evaluate
\left(y+3\right)^{2}-3y
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y^{2}+6y+9-3y
Use binomial theorem \left(a+b\right)^{2}=a^{2}+2ab+b^{2} to expand \left(y+3\right)^{2}.
y^{2}+3y+9
Combine 6y and -3y to get 3y.
y^{2}+6y+9-3y
Use binomial theorem \left(a+b\right)^{2}=a^{2}+2ab+b^{2} to expand \left(y+3\right)^{2}.
y^{2}+3y+9
Combine 6y and -3y to get 3y.
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