Question

Which of the following equations does not have a real root?

Options

• x² = 0

• 2x − 1 = 3

• x² + 1 = 0

• x³ + x² = 0

Answer 1

x² + 1 = 0

Explanation:

x² + 1 = 0

D = b² − 4ac

= 0 − 4 < 0

∴ No real root.