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15 November, 15:41

What is the value of x

4x^3+3=867

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Answers (2)
  1. 15 November, 15:42
    0
    Minus 867 from both sides

    4x³-864=0

    undistribute 4

    4 (x³-216) = 0

    factor differnce of 2 perfect cubes

    remember that a³-b³ = (a-b) (a²+ab+b²)

    so

    (4) (x³-6³) = (4) (x-6) (x²+6x+36) = 0

    set each to 0

    x-6=0

    x=6

    x²-6x+36=0

    no real numbers will work for x

    x=6
  2. 15 November, 15:48
    0
    Isolate the x:

    4x^3 = 864,

    x^3 = 216

    x = 6
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