Section B ( 41 marks )
7 . The derivative of a function f is given by
y -intercept of the graph of f is
26
� . 3
1 � � � � , and the
2
2 f ( x) x 5x
( a ) Find f ( 2 ) .
The graph of f has only one point of inflexion P .
[ 6 ]
( b ) Find the coordinates of P .
( c ) Find the range of values of x where the graph of f concaves up .
[ 5 ]
[ 2 ]
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