Update index.md absolute value (#28889)
added another example to the cases
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@ -47,6 +47,9 @@ Pythagorean Theorem: If z=a+bi, where a=Re{z} and b=Im{z}, then |z|=sqrt(a^2+b^2
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* **Simplify |(-5)^3|**
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|-125| = 125
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* **Simplify -|(4)^2|**
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-|16| = -16
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#### More Information:
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[Purplemath](https://www.purplemath.com/modules/absolute.htm)
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