Math Problem Statement

Nilai x yang memenuhi persamaan \frac{1}{2}\cdot \sqrt[3]{2^{x+1}} = \frac{1}{\sqrt{8}} adalah ...

Solution

The problem provided is:

122x+13=18\frac{1}{2} \cdot \sqrt[3]{2^{x+1}} = \frac{1}{\sqrt{8}}

We need to find the value of xx that satisfies this equation. Let's solve it step by step.

Step 1: Simplify the equation

First, let's express 8\sqrt{8} in a simpler form. We know:

8=4×2=4×2=22\sqrt{8} = \sqrt{4 \times 2} = \sqrt{4} \times \sqrt{2} = 2\sqrt{2}

Thus, the right-hand side becomes:

18=122\frac{1}{\sqrt{8}} = \frac{1}{2\sqrt{2}}

So the equation becomes:

122x+13=122\frac{1}{2} \cdot \sqrt[3]{2^{x+1}} = \frac{1}{2\sqrt{2}}

Step 2: Eliminate the common factor

Both sides of the equation have a factor of 12\frac{1}{2}, so we can cancel this out:

2x+13=12\sqrt[3]{2^{x+1}} = \frac{1}{\sqrt{2}}

Step 3: Simplify the right-hand side

Notice that 2\sqrt{2} can be rewritten as 2122^{\frac{1}{2}}. Therefore:

12=212\frac{1}{\sqrt{2}} = 2^{-\frac{1}{2}}

So the equation becomes:

2x+13=212\sqrt[3]{2^{x+1}} = 2^{-\frac{1}{2}}

Step 4: Solve for xx

Since both sides of the equation are powers of 2, we can set the exponents equal to each other. The equation simplifies to:

x+13=12\frac{x+1}{3} = -\frac{1}{2}

Step 5: Solve for xx

To solve for xx, multiply both sides by 3:

x+1=32x+1 = -\frac{3}{2}

Now, subtract 1 from both sides:

x=321=3222=52x = -\frac{3}{2} - 1 = -\frac{3}{2} - \frac{2}{2} = -\frac{5}{2}

Thus, the value of xx is:

x=52x = -\frac{5}{2}

Would you like further details or have any questions?


Here are 5 related questions that might help deepen your understanding:

  1. How can you verify that the solution x=52x = -\frac{5}{2} is correct by substituting it back into the original equation?
  2. What are the general properties of logarithms that could be applied to solve similar exponential equations?
  3. How does changing the base of the exponent affect the solution of the equation?
  4. How would the solution change if the equation were 2x+23=12\sqrt[3]{2^{x+2}} = \frac{1}{\sqrt{2}}?
  5. How can the equation be solved using logarithms instead of exponent rules?

Tip: When solving equations involving roots and exponents, it's often useful to express everything in terms of the same base to simplify the process.

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Math Problem Analysis

Mathematical Concepts

Algebra
Exponents
Radicals

Formulas

\sqrt{8} = 2\sqrt{2}
Power of exponents equality rule
Exponent simplification

Theorems

Exponent Rules
Radical simplification

Suitable Grade Level

Grade 10-12