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(1D) Perfect squares expansion
Expand and simplify.
$\left(-4+9x\right)^{2}$
$\left(-4-7x\right)^{2}$
$\left(5x-2y\right)^{2}$
$\left(2-5y\right)^{2}$
$\left(3+5y\right)^{2}$
$\left(-5-2x\right)^{2}$
$\left(-4x+7\right)^{2}$
$\left(3x-4y\right)^{2}$
$\left(6+7x\right)^{2}$
$\left(-7x+8\right)^{2}$