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December 20, 2014

December 20, 2014

Posted by **james** on Friday, January 1, 2010 at 2:54pm.

Directions Use the quadratic formula to solve the equation in the interval [0,2PI). Then use a graphing utility to approximate the angle x.

4cos^2x-4cosx-1=0

thanks.

- pre-cal -
**bobpursley**, Friday, January 1, 2010 at 2:57pmquadratic equation?

cosx= (4+-sqrt(16+4))/8

graph y=4cos^2 x - 4cosx + 1 and note where it crosses the y=0 axis.

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