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Pearson Algebra 1 Common Core, 2011

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Pearson Algebra 1 Common Core, 2011 View details

6. Factoring ax²+ bx + c

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Exercise 54 Page 522

Recall the concept of absolute value.

13

Practice makes perfect

An absolute value measures an expression's distance from a midpoint on a number line. |x+4|= 9 This equation means that the distance is 9, either in the positive direction or the negative direction. |x+4|= 9 ⇒ lx+4= 9 x+4= - 9 Since we are interested in the negative solution of the equation, we need to solve the second case for x.

x+4=-9

LHS-4=RHS-4

x=- 13

Finally, we can find the absolute value of the negative solution. |- 13| = 13

Subchapter links

Lesson Check p.520

Practice and Problem-Solving Exercises p.520-522

Standardized Test Prep p.522

Mixed Review p.522