(1B) The product $(a+b)(c+d)$
Practice
Expand and simplify.
*Write your answers with powers of $x$ in descending order. $\left(\square x^2 \pm \square x \pm \square\right)$
$\left(x-8\right)\left(x-8\right)$
$\left(x-3\right)\left(x+1\right)$
$\left(-x+9\right)\left(7+x\right)$
$\left(-x+7\right)\left(-1+x\right)$
$\left(3-x\right)\left(x+2\right)$
$\left(2-x\right)\left(-x+3\right)$
$\left(-7+x\right)\left(4+x\right)$
$\left(-9+x\right)\left(-3+x\right)$
$\left(-6x+1\right)\left(6x+7\right)$
$\left(7x-6\right)\left(3x-4\right)$
$\left(-2x+9\right)\left(1-4x\right)$
$\left(x+6\right)\left(-1+4x\right)$
$\left(-4+x\right)\left(5x+8\right)$
$\left(-7+4x\right)\left(-3x+4\right)$
$\left(5-4x\right)\left(-9+2x\right)$
$\left(8-3x\right)\left(1+5x\right)$