hi a ll thats a hard one:

a beam of length L is fixed at both ends and loaded uniformly by an amount w per unit length. The deflection, y, at a dsitance,x, from one end is given by:

y= w/2EL (0.5 x^4 - Lx^3 + 0.5 L^2 x^2)

where E and L are constans

i) find the maximum deflection of the beam

ii)The points of contraflexure are those where d2y/dx2=0. Find the distance of any points of contraflexure from the end of the beam.

HELP Please!!!!