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Mathematics for IGCSE & O level - Graphs Of Functions (Section 2 - No. 31)

What is the y-value of the function y = 2x² - 8 when x = 2?
0
-8
8
16

Explanation

Substitute x=2: y = 2(2)² - 8 = 2(4) - 8 = 8 - 8 = 0.

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