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Math Help - Quadratic

  1. #1
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    Quadratic

    Perform the quadratic equation on the following:

    9x + 25 = 0
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  2. #2
    is up to his old tricks again! Jhevon's Avatar
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    Quote Originally Posted by Trentt View Post
    Perform the quadratic equation on the following:

    9x + 25 = 0
    i think you mean solve the quadratic equation, you cant "perform" an equation. first just to clarify, are you sure it wasn't 9x^2 - 25 = 0?

    if not, the equation has no real solutions, the solutions will be complex numbers. so here goes.

    9x^2 + 25 = 0
    => 9x^2 = -25
    => x^2 = -25/9
    => x = +/- sqrt(-25/9)
    => x = +/- sqrt(25/9)i
    => x = +/- 5/3 i
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  3. #3
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    yeah, it wanted complex numbers, ty
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  4. #4
    is up to his old tricks again! Jhevon's Avatar
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    Quote Originally Posted by Trentt View Post
    Perform the quadratic equation on the following:

    9x + 25 = 0
    o i get what you mean now, you mean use the quadratic formula to solve it.
    ok, here goes:

    9x^2 + 25 = 0

    => x = [0 +/- sqrt(0 - 4(9)(25)]/2(9)
    => x = +/- sqrt(-900)/18
    => x = +/- sqrt(900)i/18
    => x = +/- 30/18 i
    => x = +/- 5/3i
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