Page 8 - ACE YR IGCSE A TOP APPR' TO ADD MATH

(b) Find
(i) gf(x).

[2]
(ii) fg(x).

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[2]

11. Given f(x) = 3x , x ≠ −1.
x + 1

(a) Find the function f .
−1

[3]

(b) State the value of x such that f does not exist.
−1

[1]

12. Given that f(x) = 5 − 2x and g(x) = 5x.
Find the value of
(a) f (−3).
−1

[2]
(b) (gf) (−5).
−1

[3]

Chapter 1 Functions 5

Chapter 1 Add Math (1 to 12).indd 5 14/03/2022 12:16 PM