Find the rate of change (dy/dx) for the prescribed value of x.

y = (x^2 + 2) (x + square root of x) x=4

y = (x^2 + 2)(x + x^-1/2)

y = (x^2 + 2)(1/2square root x) + (x + 1/2square root of x)(2x)

If that is correct thus far, how do I go about multipling this out?