differentiation

水哥大帝

(1)  
Using the iteration formila
Xn+1=(22Xn+50)^1/4 and  X0=3.5

find a root of the equation x^4-22x-50=0 TO 4sf

(2)  During the boost stage of a rocket launch, the height h in metres, after t seconds is given  h=3t^4-2t^3+15t2

A.Find the velocity of the rocket at t=3 secs
B.Find the acceleration of the rocket at t=3 secs

Naozumi

第1題,純粹用條iteration formula照計喎,用excel計一計啦
第2題 v = dh/dt 再代 t = 3
         a = second derivative of h at t = 3