Easy -1.8 This is a 1-mark multiple choice question testing basic recall of when functions have inverses (one-to-one property). Students only need to recognize that x² is not one-to-one over all real numbers, requiring minimal calculation or reasoning—significantly easier than average A-level questions.
Each of these functions has domain \(x \in \mathbb{R}\)
Which function does not have an inverse?
Circle your answer.
[1 mark]
\(f(x) = x^3\) \quad \(f(x) = 2x + 1\) \quad \(f(x) = x^2\) \quad \(f(x) = e^x\)
Each of these functions has domain $x \in \mathbb{R}$
Which function does not have an inverse?
Circle your answer.
[1 mark]
$f(x) = x^3$ \quad $f(x) = 2x + 1$ \quad $f(x) = x^2$ \quad $f(x) = e^x$
\hfill \mbox{\textit{AQA Paper 2 2019 Q3 [1]}}