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Expand and simplify.
*Write your answers with powers of $x$ in descending order. $\left(\square x^2 \pm \square x \pm \square\right)$

$\left(x+9\right)\left(x-8\right)$

$\left(x-5\right)\left(x-3\right)$

$\left(x-2\right)\left(4-x\right)$

$\left(x-4\right)\left(-6+x\right)$

$\left(3-x\right)\left(x+8\right)$

$\left(6+x\right)\left(x-1\right)$

$\left(7-x\right)\left(3+x\right)$

$\left(3-x\right)\left(1+x\right)$

$\left(-6x+1\right)\left(-x+6\right)$

$\left(-3x+4\right)\left(-9x+4\right)$

$\left(4x+1\right)\left(3+2x\right)$

$\left(-3x+2\right)\left(9-2x\right)$

$\left(9+x\right)\left(x+4\right)$

$\left(3-8x\right)\left(x+8\right)$

$\left(-5+3x\right)\left(4+3x\right)$

$\left(3+7x\right)\left(2+7x\right)$