Analysis and Approaches for IBDP Maths Ebook 2 | Page 81

Solution
(a) For correct shape A1
For correct asymptote
A1
For correct intercepts
A1
[3]
7
(b)
x
� x
�sec � 2 2
2 3
x
� x
� sec � � 0
2 2
2 3
By considering the graph of
2 � x 3
y� x � sec � , 2 2
x � 0.4433161 or x � 1.6388289 . (M1) for valid approach
�x
� 0.443 or x � 1.64
A2
[3]
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