Mathematics for IGCSE & O level - Graphs Of Functions (Section 3 - No. 32)
Which of the following would be considered a root of the graph of y = x² - 9?
x = 0
x = 3
y = 0
y = -9
Explanation
The roots are the x-intercepts, where y=0. Factoring we get (x-3)(x+3) =0 thus x=3 or x=-3.
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