Exponential and power functions defns.

First of all, this has nothing to do with HW help or anything, jsut want to clear some things up. I had a few quick questions in terms of what actually is considered a power function.

Would x^2-25 be considered a power function, with k=1, and p=2? Would the -25 just be considered the y-intercept then? Or a power funtion HAVE to be exactly in kx^p form?

Also,(4+x)/(5x^4) is only a polynomial, and is technically not an exponential or power function correct?

This brings me to my final question: Is a power function considered a polynomial? But is a polynomial function considered a power function?

Thanks for any input.

>>4
>I forgot that the sqrt function isn't a polynomial.
*facepalm*