Quadratic Equation

2  

-1

1

None of the above

If b² – 4ac is a perfect square, the roots are rational

If b² = 4ac , the roots are real and equal.

If b² – 4ac is negative, no real roots exist.

If b² = 4ac , the roots are real and unequal.

(a) ± 9

(b) ± 18

 (c) ± 27

(d) ± 54