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Quadratic Equations $x^2+bx+c=0$

Review of Factorizing

Expand $x\left(x-4\right)=$
$\quad$ Factorize $x^2-4x=$ $\bigl(x-$ $\bigl)$
Expand $3x\left(x+7\right)=$
$\quad$ Factorize $3x^2+21x=$ $\bigl(x+$ $\bigl)$
Expand $\left(x+1\right)\left(x+2\right)=x^2+$ $x+$
$\quad$ Factorize $x^2+3x+2=\bigl(x+$ $\bigl)\bigl(x+$ $\bigl)$
Expand $\left(x-5\right)\left(x+3\right)=x^2-$ $x-$
$\quad$ Factorize $x^2-2x-15=\bigl(x-$ $\bigl)\bigl(x+$ $\bigl)$
Expand $\left(x-4\right)\left(x-8\right)=x^2-$ $x+$
$\quad$ Factorize $x^2-12x+32=\bigl(x-$ $\bigl)\bigl(x-$ $\bigl)$
Expand $\left(x-3\right)\left(x+3\right)=x^2-$
$\quad$ Factorize $x^2-9=\bigl(x+$ $\bigl)\bigl(x-$ $\bigl)$
Expand $\left(x-6\right)^2=x^2-$ $x+$
$\quad$ Factorize $x^2-12x+36=\bigl(x-$ $\bigl)$
Expand $6\left(x+4\right)\left(x-1\right)=$
$\quad$ Factorize $6x^2+18x-24=$ $\bigl(x+$ $\bigl)\bigl(x-$ $\bigl)$
Expand $5\left(x-5\right)\left(x+5\right)=$
$\quad$ Factorize $5x^2-125=$ $\bigl(x-$ $\bigl)\bigl(x+$ $\bigl)$
Expand $3\left(x-4\right)^2=$
$\quad$ Factorize $3x^2-48=$ $\bigl(x+$ $\bigl)\bigl(x-$ $\bigl)$
Fully factorize:
$7x^2-28x$
$9x^2-63x$

$x^2+15x+56$
$x^2+9x$

$x^2+3x-28$
$x^2+10x+25$

$x^2+6x-7$
$x^2-2x$

$x^2+5x-36$
$x^2-2x-24$

$x^2-49$
$x^2-x-6$

$x^2+x-12$
$x^2-9$

$x^2-7x-18$
$x^2+5x+4$

$-3x^2-21x$
$x^2-6x$

$x^2-36$
$x^2-64$

$x^2-x-20$
$x^2+13x+42$
Solve for $x$. If there are multiple answers, separate them with commas.
$2x^2-72=0 \qquad x=$
$4x^2-4x=0 \qquad x=$

$x^2-18x+81=0 \qquad x=$
$2x^2+4x-16=0 \qquad x=$

$x^2+7x-8=0 \qquad x=$
$-5x^2-45x-90=0 \qquad x=$

$x^2+7x=0\qquad x=$
$x^2+6x+8=0 \qquad x=$

$-3x^2+75=0 \qquad x=$
$3x^2-9x-84=0 \qquad x=$

$4x^2-36x+80=0 \qquad x=$
$-8x^2-8x+96=0 \qquad x=$

$7x^2+42x+63=0 \qquad x=$
$x^2-25=0 \qquad x=$

$-5x^2+45x-90=0 \qquad x=$
$x^2-x-56=0 \qquad x=$

$-5x^2-5x+60=0 \qquad x=$