Factorisation by Finding the Difference between Two Squares

Factorise $x^2-4x+4$

Factorise $16a^2-4b^2$

Factorise:

$x^4-y^2$

Factorise:

$\frac{1}{0.09a^2}-0.0081b^2$

Factorise:

${\left(x-y\right)}^2-{\left(y-z\right)}^2$

Factorise,

$64{\left(a+b\right)}^2-\frac{49}{{\left(x+y\right)}^2}$

Factorise:

$\frac{1}{{\left(x+y\right)}^2}-16a^2$

Factorise:

$\frac{a^2{b}^2}{16}-\frac{x^2{y}^2}{81}$

Factorise:

$x^2-\frac{16}{25}{y}^2$

Factorise:

$a^2-4b^2$

Factorise:

$9x^2-\frac{1}{36}{y}^2$

Factorise:

$121x^2-y^2$

Factorise:

$25x^2-36{\left(y-z\right)}^2$

Factorise:

$\frac{y^2}{144}-\frac{z^2}{64}$

Factorise:

$x^4-4y^4$

Factorise:

${\left(x+y\right)}^4-9$

Factorise:
$9x^3{y}^6-81x^3{y}^3$

Factorise:
$\frac{144}{a^2{b}^2}-\frac{x^2}{y^2}$

The factors of $4x^2-9$ are

Factorise $9x^2-30x-11$