Posted by **Natalie** on Thursday, April 11, 2013 at 2:04pm.

What value(s) of x from 0 to 2pi solve the following equation: cos squared x - cos x - 6 = 0

- Precalc with Trig -
**Steve**, Thursday, April 11, 2013 at 2:52pm
cos^2 - cos - 6 = 0

(cos-3)(cos+2) = 0

cos = 3 or -2

Bzzzt. |cos| <= 1, so not possible.

If there's a typo, fix it and apply the same steps.

- Precalc with Trig -
**Natalie**, Thursday, April 11, 2013 at 2:57pm
There isn't a typo this is the equation my professor gave us, thanks for the help!

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