The discriminant is .. d = b^2 -4*a*c When the roots are imaginary, it is less than zero. You have a=4, so that means .. b^2 -16c < 0 .. b^2 < 16c . . . . . . . . . . . . . . . . . coresponds to the 7th choice
This does not say it is part of a timed test. I will trust you to tell me if it is. The discriminate is sqrt(b^2 - 4ac) a is given as 4. That makes the discriminate = sqrt(b^2 - 16c) To get imaginary roots, you have to be taking the square root of something < 0
