O-Level Additional Mathematics (4049) Practice Questions - Singapore-Cambridge GCE Ordinary Level Additional Mathematics (Syllabus 4049) Exam

For what values of k does the quadratic equation x^2 + kx + 9 = 0 have two equal real roots?

k = 6 only k = ±6 k = ±3 k = 9

Correct Answer:

k = ±6

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