You can put this solution on YOUR website! The given expression will be undefined when the denominator equals zero. This is because division by zero cannot be defined.
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The value of m which will cause this condition can be found by setting the denominator equal to zero:
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3 - m = 0
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Solve for m by adding +m to both sides and you get:
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3 = +m
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So when m is +3, the expression will be undefined.