Math Problem Statement

Nilai x yang memenuhi persamaan (√27)^(2x-5) = 1/3^6 adalah ...

Solution

To solve the equation:

(27)2x5=136\left( \sqrt{27} \right)^{2x-5} = \frac{1}{3^6}

Step 1: Simplify the square root

The square root of 2727 can be written as: 27=271/2=(33)1/2=33/2.\sqrt{27} = 27^{1/2} = (3^3)^{1/2} = 3^{3/2}.

Thus, the base becomes 33/23^{3/2}.

Step 2: Rewrite the left-hand side

(27)2x5=(33/2)2x5.\left( \sqrt{27} \right)^{2x-5} = \left( 3^{3/2} \right)^{2x-5}.

Using the power rule (am)n=amn(a^m)^n = a^{m \cdot n}: (33/2)2x5=3(3/2)(2x5)=33x15/2.\left( 3^{3/2} \right)^{2x-5} = 3^{(3/2)(2x-5)} = 3^{3x - 15/2}.

Step 3: Rewrite the right-hand side

136=36.\frac{1}{3^6} = 3^{-6}.

Step 4: Equate the exponents

Since the bases are the same, equate the exponents: 3x152=6.3x - \frac{15}{2} = -6.

Step 5: Solve for xx

  1. Add 152\frac{15}{2} to both sides: 3x=6+152.3x = -6 + \frac{15}{2}.

  2. Rewrite 6-6 as 122-\frac{12}{2} for a common denominator: 3x=122+152.3x = -\frac{12}{2} + \frac{15}{2}.

  3. Simplify: 3x=32.3x = \frac{3}{2}.

  4. Divide both sides by 3: x=32÷3=3213=12.x = \frac{3}{2} \div 3 = \frac{3}{2} \cdot \frac{1}{3} = \frac{1}{2}.

Final Answer:

The value of xx is: 12.\boxed{\frac{1}{2}}.

Let me know if you have any questions or want further clarification!


Here are 5 related questions to practice:

  1. How do you simplify (am)n(a^m)^n when dealing with exponents?
  2. What is the square root of 8181 written as a power of 3?
  3. How would you rewrite 1xn\frac{1}{x^n} using a negative exponent?
  4. What are the properties of exponents that allow simplification of fractional powers?
  5. Can you solve (16)2x+1=42(\sqrt{16})^{2x+1} = 4^{-2} for xx?

Tip: Always express roots and fractional bases in terms of their prime factors when solving exponent equations.

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Math Problem Analysis

Mathematical Concepts

Exponents
Simplification of Roots
Algebraic Equations

Formulas

√a = a^(1/2)
(a^m)^n = a^(m*n)
1/a^n = a^(-n)

Theorems

Properties of Exponents
Rules for Equating Exponents

Suitable Grade Level

Grades 10-12