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Emily778

  • one year ago

WHAT IS THE SOLUTION to 2x^2+x+2=0?

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  1. Emily778
    • one year ago
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    by adding them both together.

  2. Emily778
    • one year ago
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    umm, hello?

  3. dvada191
    • one year ago
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    it has imaginary roots

  4. dvada191
    • one year ago
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    \[x=-0.25\pm 0.968i\]

  5. phi
    • one year ago
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    For this problem, you should use the quadratic formula see http://www.khanacademy.org/math/trigonometry/polynomial_and_rational/quad_formula_tutorial/v/using-the-quadratic-formula for how to do it. You will get a minus number inside a square root, which means a complex number.

  6. Emily778
    • one year ago
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    isn't the answer x=-1+isqrt15/2?

  7. phi
    • one year ago
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    almost, the bottom should be 2*a = 4 \[ x= \frac{-1 ± \sqrt{15} \ i}{4} \]

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