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