Further MathematicsPolynomials and the remainder theoremWAEC
For what values of k does x² + kx + 9 = 0 have equal roots?
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Answer: D. k = ±6
Equal roots need b² − 4ac = 0: k² − 36 = 0, so k = ±6.
An AdmitMe practice question, written for the WAEC syllabus. Not an official past question.