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anonymous

  • one year ago

Will give a medal. Need help urgently. Which of the following is a solution of x^2 + 5x = -2?

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  1. anonymous
    • one year ago
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  2. P0sitr0n
    • one year ago
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    \[\frac{-5\pm\sqrt{17}}{2}\] by solving it using the quadratic formula

  3. anonymous
    • one year ago
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    Can you explain it completely so that I know how to do it in the future?

  4. P0sitr0n
    • one year ago
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    Recall that is \[\frac{-b\pm\sqrt{b^2-4ac}}{2a}\], where a is the coefficient of x^2 (1 in our case), b is of x (5 in our case) and c is the constant term (2 in our case, dont forget the total experssion must be = 0)

  5. P0sitr0n
    • one year ago
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    This will give you two roots, (note the plus / minus)

  6. anonymous
    • one year ago
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    ok.. then you just solve right @P0sitr0n ?

  7. P0sitr0n
    • one year ago
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    yep

  8. P0sitr0n
    • one year ago
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    this formula was derived specifically for this purpose

  9. P0sitr0n
    • one year ago
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    that said, don't forget to always check that the term under the square root (called the dicriminant) is always positive or zero

  10. P0sitr0n
    • one year ago
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    basically you only plug in a, b and c into the formula (those coefficients are taken from your equation)

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