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Find the discriminant (D) of x² - 4x + 4 = 0.

medium MCQ Class 8 · Mathematics · Algebraic Expressions and Identities
  1. D = 0
  2. D = 16
  3. D = -16
  4. D = 4
Answer
D = 0

The correct answer is D = 0 — D = (-4)² - 4(1)(4) = 16 - 16 = 0.

Step-by-step solution

  1. D = b² - 4ac.
  2. D = (-4)² - 4(1)(4) = 16 - 16 = 0.

Concept tested: Quadratic Discriminant

Published · How this solution was prepared and checked

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