Further MathematicsFunctions and rational functionsWAEC
Find the inverse of f(x) = (x + 4)/3.
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Answer: D. 3x − 4
y = (x + 4)/3 gives x = 3y − 4, so f⁻¹(x) = 3x − 4.
An AdmitMe practice question, written for the WAEC syllabus. Not an official past question.