Friday

October 31, 2014

October 31, 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.

**Answer this Question**

**Related Questions**

Pre-Cal - Hi, can someone please solve this step-by-step for me? I really don't ...

More trig - Use the Quadratic Formula to solve the equation in the interval [0,...

Trigonometry - Directions: Use a graphing utility to approximate the solutions ...

Pre-Calc/Math - Use factoring, the quadratic formula, or identities to solve cos...

Pre-Calculus - 1) Use a graphing utility to obtain the graph of the function. ...

precalculus - Use the Intermediate Value Theorem and a graphing utility to find...

Pre-Cal - Approximate the equation's soultions in the interval (o, 2pi). If ...

Pre-Cal(Please help) - Approximate the equation's soultions in the interval (o...

math - Use a graphing calculator to solve the equation 3 tan=(1)/(3)è=8 in the ...

Math - Algebra - A. Solve the following quadratic equations. Make sure to show ...