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BMI229

  • 3 years ago

Can someone please give me an example of a sum of cubes equation...Please

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  1. mathstudent55
    • 3 years ago
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    Can you do complex (imaginary) solutions, or only real solutions?

  2. BMI229
    • 3 years ago
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    I just need an example worked out all the way.

  3. mathstudent55
    • 3 years ago
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    x^3 + 27 = 0

  4. mathstudent55
    • 3 years ago
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    Notice that 27 = 3^3, so this is the sum of the cube of x and the cube of 3. x^3 + 3^3 = 0 The first step is to factor it.

  5. mathstudent55
    • 3 years ago
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    (x + 3)(x^2 - 3x + 9) = 0

  6. BMI229
    • 3 years ago
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    Thanks bro

  7. mathstudent55
    • 3 years ago
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    Now to solve the equation, do x + 3 = 0 or x^2 - 3x + 9 = 0 The left side is x = -3. For the right side, use the quadratic formula.

  8. mathstudent55
    • 3 years ago
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    wlcm

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