The deflection of a uniform beam subject to a linearly increasing distributed load can be computed as 120 E I L (−x5 + 2L2x3 − L4x) Given that L = 600 cm, E = 50,000 kN/cm2, I = 30,000 cm4, and 0 = 2.5 kN/cm, determine the point of maximum deflection (a) graphically, (b) using the golden-section search until the approximate error falls below εs = 1% with initial guesses of xl = 0 and xu = L.