\"\"

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The equation is \"\"

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Write two cases:

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Case-1: \"\".

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\"\"

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Case-2: \"\"

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\"\"  \"\"

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Solve the equation for Case-1.

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\"\"

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Subtraction property of equality: if \"\", then \"\".

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\"\"                                       (Subtract 4 from each side)

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\"\"                                         (Apply Additive inverse property: \"\")

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\"\"                                               (Subtract: \"\") \"\"

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Check:

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To check the solution, substitute \"\"in original equation.

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\"\"

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\"\"                                               (Add: \"\")

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The absolute value of \"\" is 17.

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\"\"

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Compare the values the equation is true. \"\" is a solution.\"\"

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Solve the equation for Case-2.

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Subtraction property of equality: if \"\", then \"\".

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\"\"

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\"\"                                  (Subtract 4 from both sides)

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\"\"                                             (Subtract: \"\")\"\"

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Check:

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To check the solution, substitute \"\"in original equation.

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\"\"

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\"\"                                        (Add: \"\")

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\"\"                                                        (The absolute value of \"\" is 17)

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Compare the values the equation is true. \"\"is a solution.\"\"

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The solutions are 13 and-21. The solution set is \"\".