Master P59 STRENGTHEN Check P74 Extend P80 Test P84 3 Strengthen You will learn to: • Strengthen your understanding with practice. Functions Q1a hint 1 Work out the outputs of these function machines. Input Output b a Input Add £2 £5 2 c Input 18 Output d Input Subtract £1 £5 5+2=u Output Output 7 23 Q1c hint 2 Work out the outputs of these function machines. a Input b Input Output 1 5 5−1=u Output 7 Add 4 Subtract 6 10 16 Q2a hint 3 Work out the outputs of these function machines. Input Output b a Input 5 Multiply by 3 8 34 3 c Input Output d Input Divide by 2 Input 4 a Work out the missing outputs of this function machine. b Copy and complete the table to show all the inputs and outputs. 2 Output 20 Output 43 9 Input Output 2 Multiply by 10 5 8 5 1+4=u 5+4=u Output 20 8 5 Follow these steps to find the function of this machine. Input Output 5 6 10 12 ? 8 16 a What are the possible functions for the first input and output? b Try both possible functions for 6 Which one works? ? 12 c Check the function works for ? 16 8 Q5a hint 5 + u = 10 5 × u = 10 d Write down the function that works for all the inputs and outputs. Unit 3 Expressions, functions and formulae 76