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Pearson Algebra 1 Common Core, 2011 View details

8. Unions and Intersections of Sets

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Exercise 49 Page 220

How many cases do you have after you remove the absolute value?

x=4 or x=- 4

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An absolute value measures an expression's distance from a midpoint on a number line. |x|=4 This equation means that the distance between x and 0 is 4, either in the positive direction or the negative direction. This can be expressed as a pair of equations equivalent to the absolute value equation. |x|=4 ⇒ lx= 4 x= - 4