Graphs 7
2 marks · EasyThe graph of y = x^2 is drawn for −3 ≤ x ≤ 3. Use the graph to solve x^2 = 4. Write down all solutions.
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x = 2 or x = -2
Also accept: 2 and -2; x = -2 and x = 2
Common mistakes: 4 and -4
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Marking points
M1 · 1 mark · States to find intersection points of y = x^2 and y = 4 or equivalent reasoning.
A1 · 1 mark · Correctly writes both solutions x = 2 and x = -2.
Worked solution
Set y = x^2 and y = 4. The points of intersection are where x^2 = 4, so x = 2 or x = -2.