Algebra 2 help!

Use the quadratic formula to solve the equation.

-x^2+5x=11

a.5/2 +- sqrt13/2
b.-5/2 +- sqrt13/2
c.2/5 +- sqrt13/2
d.-2/5 +- sqrt13/2

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asked by Maria
  1. first make the equation more presentable
    ....

    x^2 - 5x + 11 = 0

    x = (5 ± √-19)/2

    none of the answers match this, so there has to be a typo.

    since all answers contain √13
    your equation could have been
    x^2 - 5x + 3 = 0
    that would give you x = (5 ± √13)/2, which matches a)

    check your typing.

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    posted by Reiny
  2. the equation i posted is the equation i have to use.

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    posted by Maria
  3. then, as I said before,

    x = (5 ± √-19)/2

    none of the choices match, that's all there is to say.

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    posted by Reiny

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