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2.Rational Equation - A rational equation is an equation containing at least one fraction whose numerator and denominator are polynomials, \frac{P(x)}{Q(x)}. Q(x)P(x). These fractions may be on one or both sides of the equation.
3.Rational Inequality - A rational inequality is an inequality which contains a rational expression. The trick to dealing with rational inequalities is to always work with zero on one side of the inequality. ... A rational expression changes its sign only at its zeros and its undefined values.