ACT Preparation / Unit 9 ACT 0821 short lesson, about 20 seconds
Absolute Value Inequalities
Captions available
The idea
|x − a| < b means within b of a: −b < x − a < b. |x − a| > b means farther than b: two pieces.
In practice
|x − 4| < 3 gives 1 < x < 7; |x − 4| > 3 gives x < 1 or x > 7.
Where people slip
Less than: between. Greater than: outside.
Your place on the trail
Every lesson rests on earlier ones and opens later ones. Tap any to jump.
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