Which equation has rational roots?
Ax² + x + 1 = 0
Bx² - 2x - 1 = 0
Cx² - 3x + 1 = 0
Dx² - 5x + 6 = 0
Answer & Solution
Correct answer: D. x² - 5x + 6 = 0
Its discriminant is 25 - 24 = 1, a perfect square, so the roots 2 and 3 are rational.
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