Math Problem Statement

2|2x-3|<|x+10|

Solution

To solve the inequality 22x3<x+102|2x - 3| < |x + 10|, we need to break it into different cases based on the expressions inside the absolute value signs.

Step 1: Set up the cases

The absolute value function creates different scenarios depending on whether the expression inside is positive or negative. For the expression 2x3|2x - 3| and x+10|x + 10|, we will examine the following cases:

Case 1: 2x302x - 3 \geq 0 and x+100x + 10 \geq 0

  • Here, 2x3=2x3|2x - 3| = 2x - 3 and x+10=x+10|x + 10| = x + 10.

The inequality becomes: 2(2x3)<x+102(2x - 3) < x + 10 Simplifying: 4x6<x+104x - 6 < x + 10 Subtract xx from both sides: 3x6<103x - 6 < 10 Add 6 to both sides: 3x<163x < 16 Divide by 3: x<163x < \frac{16}{3} Since this case assumes 2x302x - 3 \geq 0, this implies x32x \geq \frac{3}{2}.

Therefore, the solution for this case is 32x<163\frac{3}{2} \leq x < \frac{16}{3}.

Case 2: 2x302x - 3 \geq 0 and x+10<0x + 10 < 0

  • Here, 2x3=2x3|2x - 3| = 2x - 3 and x+10=(x+10)=x10|x + 10| = -(x + 10) = -x - 10.

The inequality becomes: 2(2x3)<x102(2x - 3) < -x - 10 Simplifying: 4x6<x104x - 6 < -x - 10 Add xx to both sides: 5x6<105x - 6 < -10 Add 6 to both sides: 5x<45x < -4 Divide by 5: x<45x < -\frac{4}{5} However, this case assumes x+10<0x + 10 < 0, meaning x<10x < -10. The solution x<45x < -\frac{4}{5} does not satisfy x<10x < -10, so there is no solution in this case.

Case 3: 2x3<02x - 3 < 0 and x+100x + 10 \geq 0

  • Here, 2x3=(2x3)=2x+3|2x - 3| = -(2x - 3) = -2x + 3 and x+10=x+10|x + 10| = x + 10.

The inequality becomes: 2(2x+3)<x+102(-2x + 3) < x + 10 Simplifying: 4x+6<x+10-4x + 6 < x + 10 Add 4x4x to both sides: 6<5x+106 < 5x + 10 Subtract 10 from both sides: 4<5x-4 < 5x Divide by 5: x>45x > -\frac{4}{5} This case assumes 2x3<02x - 3 < 0, which implies x<32x < \frac{3}{2}.

Therefore, the solution for this case is 45<x<32-\frac{4}{5} < x < \frac{3}{2}.

Case 4: 2x3<02x - 3 < 0 and x+10<0x + 10 < 0

  • Here, 2x3=(2x3)=2x+3|2x - 3| = -(2x - 3) = -2x + 3 and x+10=(x+10)=x10|x + 10| = -(x + 10) = -x - 10.

The inequality becomes: 2(2x+3)<x102(-2x + 3) < -x - 10 Simplifying: 4x+6<x10-4x + 6 < -x - 10 Add 4x4x to both sides: 6<3x106 < 3x - 10 Add 10 to both sides: 16<3x16 < 3x Divide by 3: [ x > \frac{16}{

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Math Problem Analysis

Mathematical Concepts

Algebra
Absolute Value Inequalities
Case Analysis

Formulas

Absolute value definition: |a| = a if a ≥ 0, -a if a < 0

Theorems

Properties of absolute values
Solving inequalities by case analysis

Suitable Grade Level

Grades 10-12