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iGCSE (2021 Edition)

4.01 Function notation

Interactive practice questions

Suppose that $\left(7,-6\right)$(7,6) is an ordered pair that satisfies the function $g$g. Write this situation using function notation.

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Consider the function $f\left(x\right)=8x+6$f(x)=8x+6.

Consider the function $f\left(x\right)=-9x^2-8x-4$f(x)=9x28x4.

Use the graph of the function $f\left(x\right)$f(x) to find each of the following values.



Understand the terms: function, domain, range (image set), one-one function, inverse function and composition of functions.


Use function notation. e.g. f(x) = sin x, f: x ↦ sin x, f(x) = lg x or f: x ↦ lg x.


Solve simple simultaneous equations in two unknowns by elimination or substitution.

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