About Solving Rational Equations:

To solve a rational equation, we will multiply both sides by the LCD of all rational expressions. We must be careful since multiplying both sides by a variable or variable expression will sometimes give us extraneous solutions. Therefore, we must always check our proposed solutions for a rational equation in the original equation.


Test Objectives
  • Demonstrate an understanding of how to find the domain for a rational expression
  • Demonstrate the ability to solve a rational equation
Solving Rational Equations Practice Test:

#1:

Instructions: solve each equation.

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$$a)\hspace{.2em}\frac{1}{x^2 + 10x + 25}=\frac{1}{x + 5}- \frac{2}{x^2 + 10x + 25}$$

$$b)\hspace{.2em}\frac{1}{x + 1}=\frac{5}{x + 1}+ \frac{x + 7}{x^2 + x}$$


#2:

Instructions: solve each equation.

$$a)\hspace{.2em}\frac{x + 2}{x^2 - 3x}+ \frac{7}{x}=\frac{1}{x - 3}$$

$$b)\hspace{.2em}\frac{x - 1}{x^2 - x - 6}+ \frac{6}{x + 2}=\frac{x + 3}{x^2 - x - 6}$$


#3:

Instructions: solve each equation.

$$a)\hspace{.2em}\frac{3x - 24}{x^2 - 6x}=\frac{1}{x - 6}+ \frac{1}{x}$$

$$b)\hspace{.2em}1=\frac{1}{x}+ \frac{x^2 - 2x - 3}{x^2 + 6x}$$


#4:

Instructions: solve each equation.

$$a)\hspace{.2em}\frac{x}{2x^2 + 10x + 8}- \frac{x - 7}{x + 4}=\frac{1}{x + 1}$$

$$b)\hspace{.2em}1 - \frac{7}{x}=\frac{6x^2 + 12x - 18}{x^2 + 4x}$$


#5:

Instructions: solve each equation.

$$a)\hspace{.2em}1 - \frac{2x - 6}{x}=\frac{3x^2 + 21x - 24}{x^2 - 5x}$$

$$b)\hspace{.2em}\frac{x + 5}{x - 4}+ \frac{1}{x - 4}=\frac{7}{x^2 - 4x}$$


Written Solutions:

#1:

Solutions:

$$a)\hspace{.2em}x=-2$$

$$b)\hspace{.2em}x=-\frac{7}{5}$$


#2:

Solutions:

$$a)\hspace{.2em}x=\frac{19}{7}$$

$$b)\hspace{.2em}x=\frac{11}{3}$$


#3:

Solutions:

$$a)\hspace{.2em}x=18$$

$$b)\hspace{.2em}x=\frac{3}{7}$$


#4:

Solutions:

$$a)\hspace{.2em}x=-\frac{1}{2}, 6$$

$$b)\hspace{.2em}x=-2,-1$$


#5:

Solutions:

$$a)\hspace{.2em}x=-\frac{3}{2}, -1$$

$$b)\hspace{.2em}x=-7, 1$$