Show that the equation

x^2*e^mod(x)

Has at least two solutions for x in

-1<=x<=1.

Thanks

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- January 18th 2010, 11:00 AMalphaShowing the existence of solutions
Show that the equation

x^2*e^mod(x)

Has at least two solutions for x in

-1<=x<=1.

Thanks - January 18th 2010, 11:02 AMJhevon
- January 18th 2010, 11:20 AMalpha
Sorry. I made a typing error. Here is the corrected version.

Thank you for your help.

Show that the equation

x^2*e^mod(x)=2

Has at least two solutions for x in

-1<=x<=1. - January 18th 2010, 11:33 AMPlato
The expression is meaningless.

Should it be - January 18th 2010, 11:35 AMalpha
- January 18th 2010, 11:37 AMJhevon
- January 18th 2010, 11:39 AMskeeter
- January 18th 2010, 11:41 AMJhevon
- January 18th 2010, 11:45 AMalpha
I have no idea of how to apply this to the intermediate value theorem. Can you show me how to answer this question.

Thank you. - January 18th 2010, 11:47 AMJhevon
- January 18th 2010, 12:35 PMalpha
Well I ahve found out that the theorem is as follows:

If ƒ(*x*) is a continuous real-valued function on the closed interval from*a*to*b*, then, for any*y*between the least upper bound and the greatest lower bound of the values of ƒ, there is an*x*between*a*and*b*with ƒ(*x*) =*y*

Now how do I apply this to the question. - January 18th 2010, 12:45 PMalpha
I think i have just worked it out.

For f(x) = x^2 * e^abs(x) -2 f(-1) = e - 2 and f(0) = -2 and f(1) = e - 2

Since e - 2 > 0, f(x) changes sign between -1 and 0 and again between 0 and 1.

So there are two solutions to f(x) = 0.

Is this correct? - January 18th 2010, 12:56 PMskeeter
- January 18th 2010, 12:57 PMJhevon