anonymous
  • anonymous
Solve. 2x2 + 13x = –20
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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katieb
  • katieb
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mathslover
  • mathslover
ok lemme give you a brief intro. to quadratic equation : \[\large{ax^2+bx+c=0}\] -> general form of a quadratic equation
mathslover
  • mathslover
what do you think is the above equation , a quadratic equation?
anonymous
  • anonymous
Yes

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mathslover
  • mathslover
ok good , so remember that the roots of a quadratic equation are : \[\large{roots =\frac{-b\pm \sqrt{b^2-4ac}}{2a}}\]
mathslover
  • mathslover
put b = 13 , a = 2 and c = 20
anonymous
  • anonymous
I'm not sure
mathslover
  • mathslover
ok .. see solve this now : \[\large{\frac{-13\pm \sqrt{169-160}}{4}}\] \[\large{\frac{-13\pm \sqrt{9}}{4}}\]
anonymous
  • anonymous
x= 1/3 and x=3?
mathslover
  • mathslover
-10/4 = -5/2 and -16/4 = -4
mathslover
  • mathslover
sqrt{9}=3
anonymous
  • anonymous
Ohhh. Wait okay I see what I did wrong. Thank you!

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