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For the quadratic equation 2x^2 + 4x + k = 0 to have real roots, what must be the condition on k? (2019)

Practice Questions

1 question
Q1
For the quadratic equation 2x^2 + 4x + k = 0 to have real roots, what must be the condition on k? (2019)
  1. k > 4
  2. k < 4
  3. k >= 4
  4. k <= 4

Questions & Step-by-step Solutions

1 item
Q
Q: For the quadratic equation 2x^2 + 4x + k = 0 to have real roots, what must be the condition on k? (2019)
Solution: The discriminant must be non-negative: 4^2 - 4*2*k >= 0, which simplifies to k <= 4.
Steps: 0

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