V(t)=10-3square root t
Write a formula for the average rate of change of V on the interval [4, 4+h]
Simply your formula to a point where you could successfully plug in h=0
Hint multiply by: (2+square root of h+4)/(2 +square root of h+4).
I need help, I plugged in the intervals found the rate of change and came up with the equation of (6-3 square root of 4+h)/h and I'm just having troubles simplifying the formula. If someone could lead me in the right direction or tell me what I'm doing wrong! Thanks

Question

V(t)=10-3square root t
Write a formula for the average rate of change of V on the interval [4, 4+h]
Simply your formula to a point where you could successfully plug in h=0
Hint multiply by: (2+square root of h+4)/(2 +square root of h+4). 
I need help, I plugged in the intervals found the rate of change and came up with the equation of (6-3 square root of 4+h)/h and I'm just having troubles simplifying the formula. If someone could lead me in the right direction or tell me what I'm doing wrong! Thanks