What causes a solution to a rational equation to be an extraneous solution?
When there is more than one solution, one of the solutions is extraneous.
If a solution results in zero when substituted into the denominator of the equation, the solution is extraneous.
If a solution results in a negative number when substituted into the denominator of the equation, the solution is extraneous.
When a solution is a fraction, the solution is extraneous.

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dividing by zero breaks maths

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