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L = 4s.t + s²
432 = 4s.t + s²
t = (432 - s²)/4s
t = 108/s - (1/4)s
V = s².t ; subtitusi t = 108/s - (1/2)s
V = s².(108/s - (1/4)s)
V = 108s - (1/4)s³
turunkan persamaan di atas:
dV/ds = 108 - (3/4)s² ; subtitusi dV/ds = 0
0 = 108 - (3/4)s²
s² = (4/3).108
s² = 144
s = √144
s = 12 dm
t = 108/s - (1/4)s
= 108/12 - (1/4).12
= 9 - 3
= 6 dm
alas persegi dengan s = 12 dm, dan t = 6 dm