Carcass wrote:
How many values of x are there such that x is an integer and |3x—2|<8?
A. One
B. Two
C. Three
D. Four
E. Five
Kudos for the right answer and solution.
---------ASIDE---------------------
When solving inequalities involving ABSOLUTE VALUE, there are 2 things you need to know:
Rule #1: If |something| < k, then –k < something < k
Rule #2: If |something| > k, then EITHER something > k OR something < -kNote: these rules assume that k is positive
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Take:
|3x—2|<8Applying Rule #1, we can write:
−8<3x—2<8Add 2 to all sides to get:
−6<3x<10Divide all sides by 3 to get:
−2<x<103In other words:
−2<x<313So, the INTEGER values of
x that satisfy the above inequality are:
x=−1,0,1,2 and
3There are FIVE such values.
Answer: E
Cheers,
Brent