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(c) Find the range of f(x).
[1]
(d) State, giving a reason, whether or not f(x) has an inverse.
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= – 1
2
[1]
20. f(x) = 2x + 3x – 7, where x > k.
2
(a) Find the smallest value of k for which f(x) has an inverse.
[3]
(b) Find the coordinates of the turning point and state if it is a maximum or minimum point.
[1]
(c) Sketch the graph f(x) = |2x + 3x − 7| and state the coordinates of the points where the
2
curve meets the coordinates axes.
[3]
Cambridge IGCSE
TM
20 Ace Your Additional Mathematics
Chapter 2 Add Math (13 to 21).indd 20 14/03/2022 12:16 PM
