Question

The roots of the quadratic equation x² + 9 = 0 are

विकल्प

• real and equal

• not real

• real and negative of each other

• rational numbers

Answer 1

Not real

Explanation:

x² + 9 = 0

x² + 0.x + 9 = 0

a = 1, b = 0, c = 9 in standard from ax² + bx + c = 0.

D = b² – 4ac

= (0)² – 4(1)(9)

= –36

As, D < 0, so roots are not real.