Expand and simplify.
$\left(-7x-4\right)^{2}$
$\left(4y+5x\right)^{2}$
$\left(4x+3\right)^{2}$
$\left(-5x+4y\right)^{2}$
$\left(-3y-7x\right)^{2}$
$\left(-7x+4\right)^{2}$
$\left(-6y+5x\right)^{2}$
$\left(7y+2\right)^{2}$
$\left(-5-3x\right)^{2}$
$\left(3x+2\right)^{2}$