Math CentralQuandaries & Queries


Question from megan, a student:

When I have problems like y=x(x^2-3), to find the x- and y-intercepts, I set each one to 0. But where do I go from there?

Hi Megan,

If you set x = 0 then the equation becomes

y = 0(02 - 3) = 0

and hence the only y-intercept is y = 0.

Now set y = 0. The equation becomes

x(x2 - 3) = 0

Solve for x. You should get three values. These are the x-intercepts.

I hope this helps,

About Math Central


Math Central is supported by the University of Regina and The Pacific Institute for the Mathematical Sciences.
Quandaries & Queries page Home page University of Regina PIMS