Apps. and Interpretation for IBDP Maths Ebook 1 | Page 35

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Paper 1 – Symmetric Properties
Example
The graph of a quadratic function y � f ( x)
is given below.
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It is given that the x -intercepts are 2 and 18, and the y -coordinate of the vertex is � 25 .
(a)
(b)
Write down the equation of the axis of symmetry.
Write down the coordinates of the minimum point.
(c) Write down the range of f( x ).
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Solution
(a) x � 10
A2 N2
(b) (10, � 25)
A1 N1
(c) { y: y�� 25}
A2 N2
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