Algebra Problems 8 - Absolute Value Expressions
 
A set of intermediate algebra problems, related simplifying expressions with absolute value, are presented along with their answers. The solutions are at the bottom of the page. These questions may be used with the tutorials on Simplifying Absolute Value Expressions and exploring Absolute Value Functions.

  1. Simplify the following absolute value expressions

    a) | 5 | =

    b) | -6 | =

    c) | -7 + 10 | =

    d) | -2 - 9 | =

    e) | 10 - 20 | - | -7 | =

    f) | π - 4 | - | 2 | =

    g) | -5/3 - 1/2 | - | 7/9 - 1 1/2 | =

    h) | -1.5 - 3.9 | - | -1.6 | =

  2. Simplify the following absolute value expressions

    a) | x 2 | =

    b) | x | 2 =

    c) | | x | | =

    d) | x 2 + 4 | =

    e) | -x 4 - 9 | =

    f) | -| x | - 2 | =

    g) | -x / 3 | =

    h) | -x 2 - y 2 + 2xy| =

  3. Use absolute value to simplify the expressions

    a) √ (x 2) =

    b) √ (x + 3) 2) =

    c) √ (x 2 + 1 + 2x) =

    d) √ ( 25 / x 2) =

Answers to the Above Questions

  1. a) | 5 | = 5

    b) | -6 | = 6

    c) | -7 + 10 | = | 3 | = 3

    d) | -2 - 9 | = | -11 | = 11

    e) | 10 - 20 | - | -7 | = | -10 | - | -7 | = 10 - 7 = 3

    f) | π - 4 | - | 2 | = - (π - 4) - 2 = 2 - π

    g) | -5/3 - 1/2 | - | 7/9 - 1 1/2 | = | -13/6 | - | -13/8 | = 13/6 + 13/8 = 3 19/24

    h) | -1.5 - 3.9 | - | -1.6 | = | -5.4 | - | -1.6 | = 5.4 - 1.6 = 3.8

  2. a) | x 2 | = x 2

    b) | x | 2 = x 2

    c) | | x | | = | x |

    d) | x 2 + 4 | = x 2 + 4

    e) | -x 4 - 9 | = x 4 + 9

    f) | -| x | - 2 | = | x | + 2

    g) | -x / 3 | = | x | / 3

    h) | -x 2 - y 2 + 2xy| = | -(x 2 + y 2 - 2xy) | = | -(x - y) 2 | = (x - y) 2

  3. a) √ (x 2) = | x |

    b) √ (x + 3) 2) = | x + 3 |

    c) √ (x 2 + 1 + 2x) = √ (x + 1) 2 = |x + 1|

    d) √ ( 25 / x 2) = 5 / | x |

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