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Absolute Value
Example 9

Example 9: Absolute Value Equations

Step-by-step worked example for this lesson track.

Problem

Greater solution of x5=5 is ?\text{Greater solution of }|x-5|=5\text{ is }?

1. Recognize Pattern

xh=dx=h±d|x-h|=d\Rightarrow x=h\pm d

2. Apply Method

x10=3x{7,13}|x-10|=3\Rightarrow x\in\left\{7,13\right\}

3. Conclude

x=5±5x{0,10}x=5\pm5\Rightarrow x\in\left\{0,10\right\}

Final answer

x=5±5x{0,10}x=5\pm5\Rightarrow x\in\left\{0,10\right\}