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Mathematics for IGCSE & O level - Sketching Curves (Section 1 - No. 16)

The x-intercepts of the graph of y = (x + 3)(x - 1) are:
-3, 1
3, -1
-3, -1
3, 1

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Set each factor to zero: x+3=0 and x-1=0 which gives -3 and 1

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