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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:
$x^2-16$
$x^2-36$

$49-x^2$
$x^2-81$

$9-x^2$
$36-x^2$
Factorize:
$49x^2-9$
$81x^2-4$

$1-36x^2$
$25x^2-49$

$9-25x^2$
$81-49x^2$

$25-9x^2$
$36x^2-49$