Further MathematicsFunctions and rational functionsWAEC
If f(x) = x² − 1, find f(a + 1).
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Answer: D. a² + 2a
(a + 1)² − 1 = a² + 2a + 1 − 1 = a² + 2a.
An AdmitMe practice question, written for the WAEC syllabus. Not an official past question.