Physics

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An open box with a square base (see figure) is to be constructed from 160 square inches of material. The height of the box is 3 inches. What are the dimensions of the box? (Hint: The surface area is S = x2 + 4xh.)
1 . in. (length) × 2 . in. (width) × 3 . in. (height)

  • Physics -

    S=x²+4xh= x²+12x =160.
    x²+12x -160=0

    x=- 6±sqrt(36+160) .
    x1=-20 (impossible),
    x2= +8
    1. 8 in;
    2. 8 in;
    3. 3 in.

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