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(c) f (x)
−1
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[2]
(d) Calculate the value of x such that gf(x) = ff(x). Write your answer in exact form.
[3]
21. Given that f(x) = kx − h and f (x) = 16x − 6.
2
(a) Find the values of h and k, where h and k are both integers.
[4]
2
(b) Find the value of x for which f(x ) = 16x.
Write your answer correct to 2 decimal places.
[4]
Cambridge IGCSE
TM
12 Ace Your Additional Mathematics
Chapter 1 Add Math (1 to 12).indd 12 14/03/2022 12:16 PM
