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1.what makes expression a 1 non-rational expression
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2.what happens if the denominator of rational expressions becomes zero?
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Answer:

1.In simplifying rational expressions you need to pay attention to what values of the variable(s) in the expression would make the denominator equal zero.

2.A rational expression is undefined when the denominator is equal to zero. To find the values that make a rational expression undefined, set the denominator equal to zero and solve the resulting equation.

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