Answer:
b^2 - 4ac ==> what's inside the square root
The answer is the 2nd option
Explanation:
b^2 - 4ac represents the number of roots in the quadratic equation. If
b^2 - 4ac>0, then there are 2 roots in the quadratic equation. If
b^2 - 4ac=0, then there is only 1 root. If b^2 - 4ac<0, then the square root of b^2 - 4ac would be invalid since the square root of a negative number has no real solution. Hence, if b^2 - 4ac<0, then there are no roots.