math

Use the quadratic formula to solve the equation -x^2 + 7x = 8

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  3. 16
asked by Samantha
  1. First set into standard form:

    x^2-7x+8 = 0

    the discriminant is b^2-4ac = 49-32=17

    Now you try and plug that into the formula. After all, I know how to do it -- you need the practice

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    posted by Steve
  2. x^2 - 7 x = -8
    or
    1 x^2 - 7 x + 8 = 0

    x = [ 7 +/- sqrt(49 - 32) ] /2

    x = [ 7 +/- sqrt(17) ]/2

    x = 1.44 or 5.56

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    2. 0
    posted by Damon
  3. Thank you so much both of you! Do you think you could help me out with any more?

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    2. 0
    posted by Samantha

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