Easy -1.8 This is a simple function notation question requiring only substitution of x=2 into f(2x) to get f(4)=10. It tests basic understanding of function notation with no calculation or problem-solving required, making it significantly easier than average A-level questions.
Given that \(f(x) = 10\) when \(x = 4\), which statement below must be correct?
Tick (\(\checkmark\)) one box.
[1 mark]
\(f(2x) = 5\) when \(x = 4\)
\(f(2x) = 10\) when \(x = 2\)
\(f(2x) = 10\) when \(x = 8\)
\(f(2x) = 20\) when \(x = 4\)
Given that $f(x) = 10$ when $x = 4$, which statement below must be correct?
Tick ($\checkmark$) one box.
[1 mark]
$f(2x) = 5$ when $x = 4$
$f(2x) = 10$ when $x = 2$
$f(2x) = 10$ when $x = 8$
$f(2x) = 20$ when $x = 4$
\hfill \mbox{\textit{AQA AS Paper 1 2020 Q2 [1]}}