Use Uncertainty principle to find gound state energy?

[humanist rho]

Homework Statement

A particle of mass m is subjected to a potential V(x)=Kx.Use uncertainty principle in the form Δx.Δp≈h(bar)/2 to estimate ground state energy of the particle.

The Attempt at a Solution

I have no idea. :(

 

[Spinnor]

See example 3 below,

http://quantummechanics.ucsd.edu/ph130a/130_notes/node99.html

If you follow example 3 just replace the potential e^2/r with your potential. What textbook do you use, a similar example should be found in your text?