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8-2-7. Absolute Value

Name _____________________________________________________   Date __________________    Score _________

Keywords: Math-8-2-7

Questions

1.
Solve: $ |x| = 6 $
Hint: First case: $x = 6$, Second case: $ x = -6 $
20 points
 
2.
Solve: $ 9 = | x + 5 | $
20 points
 
3.
Solve: $ 2|x| = 18 $
40 points
 
4.
Solve: $ | x | = 0 $
20 points
 
5.
Solve: $ |x - 3| - 6 = 2 $
40 points
 
6.
Solve: $ 7 = | 3x + 9 | + 7 $
60 points
 
7.
Solve: $ 5|x + 7| + 14 = 8 $
Hint: If after simplifying the equation, it does not makes sense, what can you conclude?
80 points
 
8.
Solve: $ -|x| = \frac{1}{5} $
80 points
 
9.
Solve: $ 18 = 3|x-1| $
80 points
 
10.
Solve: $ 3|x| - 12 = 18 $
80 points
 
11.
Solve: $ \left|\frac{2}{3}x - \frac{2}{3}\right| = \frac{2}{3} $
80 points
 
12.
Solve: $ | -2x + 3 | = 5.8 $
80 points
 
13.
Solve: $ 8 = 7 - |x| $
Hint: If after simplifying the equation, it does not makes sense, what can you conclude?
80 points
 
14.
Solve: $ |x-3| + 14 = 5 $
Hint: If after simplifying the equation, it does not makes sense, what can you conclude?
80 points
 
15.
Solve: $ 3 + |x-1| = 3 $
Hint: If after simplifying the equation, it does not makes sense, what can you conclude?
80 points
 
16.
Two numbers that are 5 units from 3 on the number line are represented by the equation $ |n - 3| = 5 $. What are these numbers?
80 points
 
17.
An inspector at a bolt factory checks bolts that come off the assembly line. Any bolt with a diameter that differs by more than $0.04 \textit{ mm} $ from the $6.5 \textit{ mm} $ is sent back. Write and solve an absolute value equation to find the maximum and minimum diameters of the acceptable bolts.
Hint: $|x - \textit{ center}| = \textit{ tolerance}$
80 points
 
Possible Points: 1080
 

Solutions

  1. $ x = \{ -6, 6 \} $
  2. $ x = \{ -14, 4 \} $
  3. $ x=\{ -9, 9 \} $
  4. $ x = 0 $
  5. $ x=\{ -5, 11 \} $
  6. $ x=\{ -3 \} $
  7. No solution.
  8. $ x = -\frac{1}{5} $
  9. $ x = \{ -5, 7 \} $
  10. $ x = \{ -10, 10 \} $
  11. $ x = \{ 0, 2 \} $
  12. $ x = \{ -1.4, 4.4 \} $
  13. No solution
  14. No solution
  15. $ x = 1 $
  16. $ n = \{ -2, 8 \} $
  17. \begin{align} |x - 6.5| &= 0.04 \\\ x &= \{ 6.54 \textit{ mm}, 6.46 \textit{ mm} \} && \textit{Two solutions.} \end{align}