Maths

A box with no top is to be built by taking a 6'' - by - 10'' sheet of cardboard and cutting x - in. squares out of each corner and folding up the sides. Find the value of x that maximizes the volume of the box.

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  1. dimensions of base : (6-2x) by (10-2x), where 0 < x < 3

    volume = x(6-2x)(10-2x)
    = 60x - 32x^2 + 4x^3
    d(Volume)/dx = 60 - 64x + 12x^2
    = 0 for a maximum volume

    Using the quadratic formula I got
    x = 4.12 or x = 1.214
    but according to the above domain,
    x = 1.214

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