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(1D) Perfect squares expansion

Expand and simplify.

$\left(5x+6\right)^{2}$
$\left(-9y-4\right)^{2}$

$\left(-6x+5y\right)^{2}$
$\left(9-8x\right)^{2}$

$\left(9+5x\right)^{2}$
$\left(-5+8y\right)^{2}$

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

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