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21. (a) Sketch the graph y = (x − 7)(x + 1) and state the coordinates of the points where the
curve meets the coordinates axes.
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[3]
(b) Find the set of values of m for which |(x − 7)(x + 1)| = m has two solutions.
[2]
22. (a) Sketch the graph y = −2 + 8x − 2x and state the coordinates of the points where the
2
curve meets the coordinates axes.
[5]
(b) Find the value of s for which |(–2 + 8x − 2x )| = s has three solutions.
2
[1]
Chapter 2 Quadratic Functions 21
Chapter 2 Add Math (13 to 21).indd 21 14/03/2022 12:16 PM
