Friday

July 25, 2014

July 25, 2014

Posted by **KC** on Wednesday, September 26, 2007 at 12:17am.

1. x^2 - 2sin2x = 3x

2. x^2 = x + 3cos2x

- Trig -
**drwls**, Wednesday, September 26, 2007 at 2:10amI don't have a graphing utility. If you don't either, use a hand calculator and iterate until you get x close enough to satsfying the equation. x=0 is one solution of the first equation. There is anotherin the vicinity of x=3.

If x = 3, x^2 - 2 sin 2x - 3x = 0.558

If x = 2.9, x^2 - 2 sin 2x - 3x = 0.174

If x = 2.8, x^2 - 2 sin 2x - 3x = 0.071

If x = 2.7, x^2 - 2 sin 2x - 3x = -0.037

If x = 2.74 x^2 - 2 sin 2x - 3x = 0.007

Try x = 2.73. You can get closer by further iteration and interpolating

Use a similar method to solve the other equation

**Related Questions**

algebra2 - Plz Explain how to use a graphing calculator to solve the equation: x...

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

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

GED MATH - You are given an equation of the form y = ax2 + bx + c. y = 4x2 + 2x...

math - Find the absolute extrema of the function on the closed interval. Use a ...

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

Math-PLEASE HELP!! - I have two questions That I need help with please!! 1. ...

Pre-Calculus - Solve the equation 4sin x = e^x on the interval (0, 1). Correctly...

math - x^3 + 4x^2 + 14x + 20 use the root or zero feature of a graphing utility...

MATH - I have a test in about an hour and a half and am having some difficulty ...