Question 12: Performing the calculation \((2 x+3 y)^{2}-x(x+2) \) we get
\((2 x+3 y)^{2}-x(x+2) =\left(4 x^{2}+12 x y+9 y^{2}\right)-\left(x^ {2}+2 x\right)=4 x^{2}+12 x y+9 y^{2}-x^{2}-2 x=3 x^{2}+12 x y+9 y ^{2}-2 x \)
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Question 12: Performing the calculation \((2 x+3 y)^{2}-x(x+2) \) we get
\((2 x+3 y)^{2}-x(x+2) =\left(4 x^{2}+12 x y+9 y^{2}\right)-\left(x^ {2}+2 x\right)=4 x^{2}+12 x y+9 y^{2}-x^{2}-2 x=3 x^{2}+12 x y+9 y ^{2}-2 x \)
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