Question

HeLp

Answer 1

Multiply and simplify: \[\frac{ x^2-81 }{ x^2+18x+81 }\div \frac{ x+9 }{ x-9 } \]

Answer 2

dividing by a fraction is the same as multiplying by its reciprocal

ex.
\[\frac{a}{b}\div \frac{c}{d} = \frac{a}{b} \times \frac{d}{c}\]