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Algebra

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A 3 inch thick slice is cut off the top of a cube, resulting in a rectangular box that has volume 128in^3 .Round your answer to two decimal places

  • Algebra -

    What is the question?

  • Algebra -

    x*x*(x-3) = 128
    x^3 - 3 x^2 = 128

    x^3 - 3 x^2 - 128 = 0
    try x = 6
    216 - 108 - 128 = -20
    try x = 6.5
    19.875
    hmm try 6.25
    -1.05
    so try 6.20
    -4.99
    try 6.3
    2.98
    try 6.26
    -.248
    try 6.27
    .553
    so x = about 6.26

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