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Difference of Two Squares Factorization

Expand $\left(x+3\right)\left(x-3\right)=x^2-$
$\quad$ Factorize $x^2-9=\bigl(x+$ $\bigl)\bigl(x-$ $\bigl)$

Expand $\left(x-7\right)\left(x+7\right)=x^2-$
$\quad$ Factorize $x^2-49=\bigl(x+$ $\bigl)\bigl(x-$ $\bigl)$

Expand $\left(x-4\right)\left(x+4\right)=$
$\quad$ Factorize $x^2-16=$

Expand $\left(5-x\right)\left(5+x\right)=$
$\quad$ Factorize $25-x^2=$

Expand $\left(2x+3\right)\left(2x-3\right)=$
$\quad$ Factorize $4x^2-9=$
Factorize:
$x^2-81$
$x^2-16$

$x^2-64$
$9-x^2$

$16-x^2$
$36-x^2$
Factorize:
$16-9x^2$
$49x^2-64$

$64-25x^2$
$49x^2-16$

$4-9x^2$
$81-16x^2$

$81x^2-4$
$16x^2-1$