Algebraeasy · Past Paper
Which of the following has equal roots?
Ax^2 - 6x + 9 = 0
Bx^2 - 6x - 9 = 0
Cx^2 + 6x - 9 = 0
Dx^2 + 9 = 0
✓ Correct Answer: A — x^2 - 6x + 9 = 0
For x^2 - 6x + 9, D = (-6)^2 - 4(1)(9) = 36 - 36 = 0.
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