Expand
4x^{2}+8xy+9y^{2}
Evaluate
\left(2x+3y\right)^{2}-4xy
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4x^{2}+12xy+9y^{2}-4xy
Use binomial theorem \left(a+b\right)^{2}=a^{2}+2ab+b^{2} to expand \left(2x+3y\right)^{2}.
4x^{2}+8xy+9y^{2}
Combine 12xy and -4xy to get 8xy.
4x^{2}+12xy+9y^{2}-4xy
Use binomial theorem \left(a+b\right)^{2}=a^{2}+2ab+b^{2} to expand \left(2x+3y\right)^{2}.
4x^{2}+8xy+9y^{2}
Combine 12xy and -4xy to get 8xy.
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