Question

How do you simplify `(r^3-7r )/( r^2 - 4)`?

Answer 1

This expression does not simplify ...

Explanation:

You might be temped to cancel - but you may not because of the minus signs. Factorise as far as possible.

`(r^3 -7r)/(r^2-4) " "(larr"common factor")/(larr"difference of squares"`

`=(r(r^2-7))/((r+2)(r-2))`

This expression does not simplify ...