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# Functions

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by

## Mr Mattock

on 27 October 2016

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#### Transcript of Functions

Functions
Starter
Copy the function machine below:

Evaluate the function machine when the input is:
(a) 6
(b) 22
(c) 61
Function notation
Function machine
Using functions
f(x) = x - 5. Find f(4)
L.O. - Understand function notation,
and evaluate functions at given values.

+3
Starter
Copy the function machine below:

Evaluate the function machine when the input is:
(a) 6
3
(b) 22
5
(c) 61
8
f(x) notation

f(x)= x + 3

f:x notation

f:x x + 3
2
g:x 20 - x . Find g:-2
4
2
Using functions
f(x) = x - 5. Find f(4)
2
g:x 20 - x . Find g:-2
4
2
4 16 11
+3
+3
2
-5
-2 4 16 4
2
20 - ......
/4
Main Activity 1
Complete the Functions Worksheet
Plenary
Bingo!!! Select any 9 numbers from the numbers 1 to 25 (inc).

The function is f(x) = 3x - 2

I will give inputs, if you have the output, cross it off.
Main Activity 1
Complete the Functions Worksheet
(a) 7 (b) 7 (c) 2 (d) - 17 (e) 9 (f) 12 (g) 3 (h) 4
(a) 4 (b) 2 (c) 11 (d) -2 (e) -4 (f) -2 (g) 0.4
(h) -3 (i) 1.25 (j) -8 (k) -4 (l)
12
13
(i) c (ii) b (iii) d (iv) b
(a) f:2 = 4 and f:4 = 2. The function swaps these values.
(b) 3 and 2.5, 11 and 1.3, 7 and 1.75 etc
(c) Many functions with something/(x + something)
Key
Examples

Actvities
Activity