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(1D) Perfect squares expansion

Expand and simplify.

$\left(-9y+7x\right)^{2}$
$\left(-4x-7y\right)^{2}$

$\left(-5x-6y\right)^{2}$
$\left(-2+7x\right)^{2}$

$\left(3+8x\right)^{2}$
$\left(4+7x\right)^{2}$

$\left(8-3x\right)^{2}$
$\left(-3y-7x\right)^{2}$

$\left(5x-7y\right)^{2}$
$\left(-7+3y\right)^{2}$