# Homework Help: Show function satisfies classical waveequation

1. Oct 17, 2011

### leonne

1. The problem statement, all variables and given/known data
show that y=ex-vt)7/8

2. Relevant equations
d2y/dt2= d2y/dx2

3. The attempt at a solution
i dont understand how they solve this. in the book they have dy/dt=ezdz/dt=-7/8vez(x-vt)-1/8
I thought it would be -7/8veex-vt)7/8 not sure what they did any.
thanks

2. Oct 17, 2011

### mathfeel

Your wave equation is wrong, it should be: $\frac{\partial^2 y}{\partial t^2} = v^2 \frac{\partial^2 y}{\partial x^2}$

Just plug in the function y and take bunch of partials.

3. Oct 18, 2011

o ok thxs