Question

The equation Z³ + iZ –1 = 0 has-

• A. Three real roots
• B. One real root
• C. No real roots
• D. No real or complex roots

Answer 1

Answer: (C)

No real roots

Answer 2

Sol. Suppose x is a real root.

Then x³ + ix –1 = 0

Ž x³ – 1 = 0 and x = 0

There is no real number satisfying these two equations.