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

Question

1614 views around the world

You can reuse this answer
Creative Commons License

Answer 1 · 2017-07-27T12:55:18

This expression does not simplify ...

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 ...

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