tmv99

Thats what I thought too, it was a test question and my sister got it wrong even after putting that as the answer, thanks for your help!

remember: the quadratic formula is -b plus or minus the square root of b^2 - 4ac all over 2a 

ax^2+bx+c=0

so 

[-9(+/-) sq root of (-9^2 -(4*1*20))] / 2*1

[-9(+/-) sq rt  (81-80)] / 2

[-9(+/-) sq rt of 1] / 2

[-9(+/-)1] / 2

then you do this for both + and -

(+)

(-9+1)/ 2

-4

 (-) 

(-9-1)/2

-5

so your answer is going to be -4 and -5