Answers

  • Brainly User
2016-06-15T00:43:17+08:00
ANSWER:  d.  The roots are rational and equal.

Example:

x² + 4x + 4 = 0

a = 1     b = 4     c = 4

Discriminant = b² - 4ac
                     = (4)² - 4 (1) (4)
                     = 16 - 16
                     = 0

Check the roots by factoring:
x² + 4x + 4 = 0
(x + 2) (x + 2) = 0
x₁ + 2 = 0                 x₂ + 2 = 0
x = -2                      x = -2

The roots are equal ⇒ -2 which is also a rational number.

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