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.

Easy
Approx a minute

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.

### Outcomes

#### 0606C1.1

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

#### 0606C1.2A

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

#### 0606C6.1

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