Posted by **kyle** on Friday, December 31, 2010 at 11:36pm.

The graph of the function y= x3+6x2+7x-2cos x changes concavity at x=

- concavity -
**drwls**, Saturday, January 1, 2011 at 2:21am
Concavity changes sign where the second derivative is zero. That would be where

6x + 12 + 2 cosx = 0, which can also be written

3x + 6 + cosx = 0

This transcendental equation will have to be solved numerically by iteration.

If x = -2, 3x + 6 + cosx = -0.42

If x = -1.9, 3x + 6 + cosx = -0.02

-1.9 is close to the correct answer

## Answer This Question

## Related Questions

- Concavity-Calculus - Determine the concavity for f(x)= 4/x^2-1 I took the second...
- Calculus (final question I promise) - 1. Use calculus and algebraic methods to ...
- Math-Calculus (check please) - FOr the function f(x)=x^2e^x Find the critical ...
- Please Help! Calculus - We have to find out which of these statements are true. ...
- Math - How would you write open intervals for concavity? After you find the ...
- Calculus - 1. Locate the absolute extrema of the function f(x)=cos(pi*x) on the ...
- Calc - Various values for the derivative, f'(x), of a differentiable function f ...
- calculus - find the points of inflection and discuss the concavity of the graph ...
- Calc-slopes & concavity - 1. Let f(x)=x^3-3x+2 a.) Find the equation of the line...
- Differential Calculus - Determine all local extrema, concavity and inflection ...

More Related Questions