Question

Which of the following polynomials does not have real roots?
A.x2 - 17x - 7
B.-x2 4x 6
C.2x2 - 13
D.x2 4x 8

Answer 1

To determine if the roots are real, just determine if the discriminant is positive or negative. Negative square root means an imaginary root.
\(b^2-4ac\) negative = imaginary; positive = real