Solving Rational Equations

The videos on this page are about Solving Rational Equations, also called Fractional Equations.

$\rhd$ Equations with one rational expression (3:11) $\dfrac{14x+4}{-3x-2} = 8.$
Solution: $x = -\dfrac{-10}{19}$
$\star$ Solve for $r$ : $\dfrac{4r-6}{r-7} = \dfrac{1}{2}$
$\rhd$ Solving equations with one rational expression (advanced) Solve: $x^2 - \dfrac{x^2 - 4}{x-2} = 4$ with $x \neq 2$ .
This produces the equation $x^2 - x - 6 = 0$ , so $x = 3$ or $x = -2$ . Then he correctly verifies — doesn’t assume the conclusion! (Says: $f(-2) = 4$ after defining $f(x)$ to be the given rational expression.)
$\star$ Solving equations with one rational expression Solve $\dfrac{-3k - 38}{k^2 - 16} = -1$
$\rhd$ Equations with two rational expressions (4:16) Solve and find excluded values ( $p \neq 1, -3$ ). $\dfrac{4}{p-1} = \dfrac{5}{p+3}$ Solution: $p = 17$ , verifies solution.
$\rhd$ Equations with two rational expressions (by finding the least common multiple) (4:07) $\dfrac{5}{2x} - \dfrac{4}{3x} = \dfrac{7}{18}$ (note that $x \neq 0$ . Solution: $x = 3$ )
$\rhd$ Rational equations with extraneous solutions (3:02) Solve: $\dfrac{x^2}{x+2} = \dfrac{4}{x+2}$ . The values $x = -2$ and $x = 2$ satisfy the resulting equation, but $x = -2$ is extraneous.
$\star$ Equations with two rational expressions $\dfrac{k+5}{k^2 -5k +6} = \dfrac{k-9}{k-2}$

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The OpenLab at City Tech:A place to learn, work, and share

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