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asked May 12, 2019 26.1k views

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Yevgeniy Gendelman · Answer 1 · 2019-05-17T23:13:17+0000

This is not a function. The input x = 4 leads to infinitely many outputs. In order to have a function, any given input must have exactly one output (assuming the input is defined in the domain). Visually this graph fails the vertical line test.

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