gfields444
Solve. 2x2 + 13x = –20



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mathslover
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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

mathslover
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what do you think is the above equation , a quadratic equation?

gfields444
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Yes

mathslover
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ok good , so remember that the roots of a quadratic equation are :
\[\large{roots =\frac{b\pm \sqrt{b^24ac}}{2a}}\]

mathslover
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put b = 13 , a = 2 and c = 20

gfields444
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I'm not sure

mathslover
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ok .. see solve this now :
\[\large{\frac{13\pm \sqrt{169160}}{4}}\]
\[\large{\frac{13\pm \sqrt{9}}{4}}\]

gfields444
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x= 1/3 and x=3?

mathslover
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10/4 = 5/2 and 16/4 = 4

mathslover
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sqrt{9}=3

gfields444
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Ohhh. Wait okay I see what I did wrong. Thank you!