\enlargethispage*{2em}
\begin{enumerate}
\item $A=(x+2)^2=x^2+2\times2\times x+2^2=\boxed{x^2+4x+4}$
\item $B=(3x+2)^2=(3x)^2+2\times2\times3x+2^2=\boxed{9x^2+12x+4}$
\item $C=(3-5x)^2=3^2-2\times3\times5x+(5x)^2=\boxed{9-30x+25x^2}$
\item $D=(5x-4)^2=(5x)^2-2\times4\times10x+4^2=\boxed{25x^2-40x+16}$
\item $E=(4x-1)^2=(4x)^2-2\times1\times4x+1^2=\boxed{16x^2-8x+1}$
\item $F=(x-4)(x+4)=x^2-4^2=\boxed{x^2-16}$
\item $G=(2x+5)(2x-5)=(2x)^2-5^2=\boxed{4x^2-25}$
\item $H=(3x-7)(3x+7)=(3x)^2-7^2=\boxed{9x^2-49}$
\end{enumerate}