Algebramedium · Past Paper
Which of the following has real and equal roots?
Ax^2 - 4x + 4 = 0
Bx^2 - 4x + 5 = 0
Cx^2 - 4x + 3 = 0
Dx^2 - 4x - 4 = 0
✓ Correct Answer: A — x^2 - 4x + 4 = 0
For x^2 - 4x + 4 = 0, D = (-4)^2 - 4(1)(4) = 16 - 16 = 0.
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