10
algebra

Solve: 4<x+2<84 < |x + 2| < 8

A

2<x<62 < x < 6 or 10<x<6-10 < x < -6

B

2<x<62 < x < 6

C

10<x<6-10 < x < -6

D

6<x<2-6 < x < 2

Correct Answer: A

Choice A is the correct answer. Split into two separate compound inequalities.

  1. Positive Case: 4<x+2<82<x<64 < x + 2 < 8 \rightarrow 2 < x < 6
  2. Negative Case: 4<(x+2)<84<x2<84 < -(x + 2) < 8 \rightarrow 4 < -x - 2 < 8
    • Add 2: 6<x<106 < -x < 10
    • Multiply by -1: 6>x>10-6 > x > -10 (Reverse!)
    • Rewrite: 10<x<6-10 < x < -6
  3. Combine: 2<x<62 < x < 6 or 10<x<6-10 < x < -6

?�� Strategic Tip: This describes two intervals symmetric around the center (-2).

Choice B is incorrect because it misses the negative interval. Choice C is incorrect because it misses the positive interval. Choice D is incorrect because it represents the "hole" in the middle.