Further MathematicsFunctions and rational functionsWAEC
If f(x) = x² − 1, the range of f for real x is
Show answer
Answer: C. f(x) ≥ −1
x² ≥ 0, so x² − 1 ≥ −1.
An AdmitMe practice question, written for the WAEC syllabus. Not an official past question.