Card 1 of 21
If f(x)=3x−2f(x)=3x-2f(x)=3x−2, what is f(5)f(5)f(5)?
A
g(4)=10g(4)=10g(4)=10, so fg(4)=111fg(4)=\mathbf{\frac{1}{11}}fg(4)=111.
B
f(5)=13f(5)=\mathbf{13}f(5)=13
C
2x−6≥02x-6\geq02x−6≥0, so x≥3x\geq3x≥3.
D
Where defined, inverse functions undo the original function: f−1f(x)=xf^{-1}f(x)=xf−1f(x)=x and ff−1(x)=x\boxed{ff^{-1}(x)=x}ff−1(x)=x.
Card 1 of 21
1.5.8 Composite and inverse functions (A-level only) Flashcards
21 flashcards on AQA A Level Maths 1.5.8 Composite and inverse functions (A-level only): the key formulae, methods and definitions you need to recall for Paper 1, Paper 2 and Paper 3.