Question

Solve. 2x2 + 13x = –20

Answer 1

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

Answer 2

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

Answer 3

Yes

Answer 4

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

Answer 5

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

Answer 6

I'm not sure

Answer 7

ok .. see solve this now :
\[\large{\frac{-13\pm \sqrt{169-160}}{4}}\]
\[\large{\frac{-13\pm \sqrt{9}}{4}}\]

Answer 8

x= 1/3 and x=3?

Answer 9

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

Answer 10

sqrt{9}=3

Answer 11

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