Question 20 — IGCSE 0580 May/June 2023 Paper 21
Cambridge IGCSE Mathematics 0580, Extended tier, non-calculator. Topic: Numbers · The four rules. Worth 7 marks.
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Question text
20 The table shows some values for y = 3x2-2x-1.
x -1 -0.5 0 0.5 1 1.5
y 4 -1 0 2.75
(a) Complete the table. [1]
(b) On the grid, draw the graph of y = 3x2-2x-1 for -1 G x G 1.5 .
y
4
3
2
1
– 1 – 0.5 0 0.5 1 1.5 x
– 1
– 2
[3]
(c) By drawing a suitable straight line, solve the equation 3x2-4x-2 = 0 for -1 G x G 1.5.
x = ................................................ [3]
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