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(1H) 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 $4x^2-9=$

Expand $\left(-5a+7b\right)\left(7b+5a\right)=$
Factorize $-25a^2+49b^2=$
Factorize:
$x^2-25$
$x^2-1$

$25-x^2$
$1-x^2$

$81-x^2$
$x^2-36$
Factorize:
$1-64x^2$
$1-81x^2$

$9-25x^2$
$4-81x^2$

$81x^2-64$
$64x^2-25$

$49x^2-16$
$25x^2-4$