Algebra-1

Question Analysis
This question tests the understanding of the difference between an equation and a function by examining a specific example. The key concept is that a function must have a unique output for each input.

Key Concept Explanation
In the equation , when , can be either 5 or -5. This means that the same input (0) corresponds to two different outputs (5 and -5), which violates the definition of a function.

Step-by-step Solution
1. Substitute into the equation

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