College Algebra / Alg 101 · Atom · ~20 seconds
Rational Expressions
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A rational expression is the quotient of two polynomials; wherever the denominator's value is zero, the expression is undefined.
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A print shop's cost per poster is total cost over poster count — (50 + 2x)/x for a 50 setup fee and 2 per poster.
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The denominator's zeros are excluded, not ignored.
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