Math Problem Statement

x=?

Solve the inequality: 2 < cube root of x < square root of 5. Find x.

Solution

The inequality given is:

2<x3<52 < \sqrt[3]{x} < \sqrt{5}

To solve for xx, follow these steps:

Step 1: Cube each part of the inequality

Cubing the entire inequality will remove the cube root on x3\sqrt[3]{x}.

23<x<(5)32^3 < x < (\sqrt{5})^3

Simplifying each term:

8<x<538 < x < \sqrt{5}^3

We need to calculate 53\sqrt{5}^3, which is:

53=53/2=5×511.18\sqrt{5}^3 = 5^{3/2} = 5 \times \sqrt{5} \approx 11.18

Thus, the inequality becomes:

8<x<11.188 < x < 11.18

Final Answer:

The solution for xx is:

8<x<11.188 < x < 11.18

Would you like further details or have any questions?

Follow-up Questions:

  1. How do you simplify cube roots in inequalities?
  2. What happens when you square or cube both sides of an inequality?
  3. How does x3\sqrt[3]{x} behave differently from x\sqrt{x}?
  4. How do you find approximate values for cube roots?
  5. Can you explain the properties of fractional exponents?

Tip:

Always check if the operations you perform on inequalities are valid across the entire number range, especially when dealing with square and cube roots.

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Math Problem Analysis

Mathematical Concepts

Inequalities
Cube Roots
Square Roots
Exponents

Formulas

a < b^3 < c
Square root: √x
Cube root: ∛x
Fractional exponents: b^(3/2)

Theorems

Inequality Property: If a < b, then a^3 < b^3 when b > 0

Suitable Grade Level

Grades 9-10