Question:

How do you solve for x in this equation: 12x^3 + 8x^2 - x - 1 = 0?

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the hint says : All solutions are rational and between -1 and +1

HELP please!

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  1. You can factor it.  

    12x³ + 8x² - x - 1 = 0

    (2x + 1)(2x + 1)(3x - 1) = 0

    (2x + 1)²(3x - 1) = 0

    Then the solutions are x = 1/3, and x = -½

    Hope this helps you!

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