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