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gfields444

  • 3 years ago

Solve. 2x2 + 13x = –20

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  1. mathslover
    • 3 years ago
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    ok lemme give you a brief intro. to quadratic equation : \[\large{ax^2+bx+c=0}\] -> general form of a quadratic equation

  2. mathslover
    • 3 years ago
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    what do you think is the above equation , a quadratic equation?

  3. gfields444
    • 3 years ago
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    Yes

  4. mathslover
    • 3 years ago
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    ok good , so remember that the roots of a quadratic equation are : \[\large{roots =\frac{-b\pm \sqrt{b^2-4ac}}{2a}}\]

  5. mathslover
    • 3 years ago
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    put b = 13 , a = 2 and c = 20

  6. gfields444
    • 3 years ago
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    I'm not sure

  7. mathslover
    • 3 years ago
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    ok .. see solve this now : \[\large{\frac{-13\pm \sqrt{169-160}}{4}}\] \[\large{\frac{-13\pm \sqrt{9}}{4}}\]

  8. gfields444
    • 3 years ago
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    x= 1/3 and x=3?

  9. mathslover
    • 3 years ago
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    -10/4 = -5/2 and -16/4 = -4

  10. mathslover
    • 3 years ago
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    sqrt{9}=3

  11. gfields444
    • 3 years ago
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    Ohhh. Wait okay I see what I did wrong. Thank you!

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