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## Homework Statement

The gradient of the curve is:

[tex]\frac{9-x^{2}}{(9+x^{2})^{2}}[/tex]

Find the turning points on the curve

## Homework Equations

## The Attempt at a Solution

Well for a turning point the gradient of the curve = 0

[tex]\frac{9-x^{2}}{(9+x^{2})^{2}} = 0[/tex]

but now what to do. in the mark scheme it seems that they have multiplied by the denomintoar, but won't that loose roots?

Thanks