The equation x^2 + x - 1 = 0 has roots that are: – Algebra

Algebramedium · Past Paper

The equation x^2 + x - 1 = 0 has roots that are:

ARational

BIrrational

CImaginary

DEqual

✓ Correct Answer: B — Irrational

D = 1^2 - 4(1)(-1) = 5. Since 5 is positive but not a perfect square, roots are real and irrational.

Share this question