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