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