Math Problem Statement

1. (3x - 15) / x <= 5 - x; 2. (4t + 5) / t > 3; 3. (2x) / (x + 1) >= 1

Solution

The image contains three inequality problems. Let's solve each of them step-by-step:

1. Problem 1

3x15x5x\frac{3x - 15}{x} \leq 5 - x

Solution:

  1. Clear the fraction by multiplying both sides by xx (assuming x0x \neq 0): 3x15x(5x)3x - 15 \leq x(5 - x)

  2. Distribute and simplify: 3x155xx23x - 15 \leq 5x - x^2

  3. Rearrange the inequality to form a quadratic equation: x22x150x^2 - 2x - 15 \geq 0

  4. Factor the quadratic: (x5)(x+3)0(x - 5)(x + 3) \geq 0

  5. Determine the critical points: x=5x = 5 and x=3x = -3. Analyze the intervals: ,3-\infty, -3, (3,5)(-3, 5), and (5,)(5, \infty).

  6. Test values from each interval to find where the inequality holds: The solution is: x(,3][5,).\text{The solution is: } x \in (-\infty, -3] \cup [5, \infty).

2. Problem 2

4t+5t>3\frac{4t + 5}{t} > 3

Solution:

  1. Clear the fraction by multiplying both sides by tt (assuming t0t \neq 0): 4t+5>3t4t + 5 > 3t

  2. Rearrange the inequality: t>5t > -5

  3. Determine the valid range of tt: The solution is: t>0 and t>5    t>0.\text{The solution is: } t > 0 \text{ and } t > -5 \implies t > 0.

3. Problem 3

2xx+11\frac{2x}{x+1} \geq 1

Solution:

  1. Move 1 to the left side: 2xx+110\frac{2x}{x+1} - 1 \geq 0

  2. Combine fractions: 2x(x+1)x+10    x1x+10\frac{2x - (x + 1)}{x+1} \geq 0 \implies \frac{x - 1}{x+1} \geq 0

  3. Find critical points: x=1,1x = -1, 1.

  4. Determine where the inequality holds: [ \text{Solution: } (-\1]

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Math Problem Analysis

Mathematical Concepts

Algebra
Inequalities
Fractional Expressions

Formulas

Multiplying both sides of an inequality by a variable expression
Factoring Quadratic Equations
Analyzing Critical Points

Theorems

Zero Product Property
Sign Analysis for Inequalities

Suitable Grade Level

Grades 9-12