Further MathematicsFunctions and rational functionsWAEC
Under the mapping f: x → x² + 1, which elements of the real numbers map onto 10?
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Answer: B. −3 and 3
x² + 1 = 10 gives x² = 9, so x = ±3.
An AdmitMe practice question, written for the WAEC syllabus. Not an official past question.