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