Question

Simplify

Answer 1

\[\huge \frac{1}{81} - \frac{1}{x^2}\]factor this using a^2-b^2 = (a+b)(a-b)

Answer 2

use \[a ^{2} - b ^{2} = (a-b)\times (a+b)\]

Answer 3

I dont get your jist

Answer 4

\[\Large \frac{1}{Z}*\frac{1}{Z} = \frac{1}{Z^{2}}\]
\[81 = Z^{2}\]