Apps. and Interpretation for IBDP Maths Ebook 1 | Page 37

3. The graph of a quadratic function y �ax( x � r)
is given below.
It is given that the equation of the axis of symmetry is x �� 5 and the range of f( x ) is
{ y: y� 12.5} .
4
(a)
Write down the coordinates of the vertex.
(b) Find the values of a and r .
[1]
[5]
4. The graph of a quadratic function y � f ( x)
is given below.
It is given that the equation of the axis of symmetry is x �� 2.5 and f (0) � f ( s) � � 4 .
(a) Write down the value of s .
It is given that y � a( x � r)( x � 1) .
[1]
(b) Find the values of a and r .
(c) It is given that f(2)
� t. Write down the value of f ( � 7) in terms of t .
[4]
[1]
27
www.seprodstore.com