Math Problem Statement

Simplify the expression (6^(2n+1) * 3^(n-2)) / (18^(n+2)).

Solution

The given expression is:

62n+1×3n218n+2\frac{6^{2n+1} \times 3^{n-2}}{18^{n+2}}

Let's simplify this step by step.

Step 1: Express 1818 as a product of primes

Since 18=2×3218 = 2 \times 3^2, we can rewrite the denominator:

18n+2=(2×32)n+2=2n+2×32(n+2)18^{n+2} = (2 \times 3^2)^{n+2} = 2^{n+2} \times 3^{2(n+2)}

Thus, the expression becomes:

62n+1×3n22n+2×32(n+2)\frac{6^{2n+1} \times 3^{n-2}}{2^{n+2} \times 3^{2(n+2)}}

Step 2: Express 66 as a product of primes

Since 6=2×36 = 2 \times 3, we can rewrite 62n+16^{2n+1}:

62n+1=(2×3)2n+1=22n+1×32n+16^{2n+1} = (2 \times 3)^{2n+1} = 2^{2n+1} \times 3^{2n+1}

Now the expression becomes:

22n+1×32n+1×3n22n+2×32n+4\frac{2^{2n+1} \times 3^{2n+1} \times 3^{n-2}}{2^{n+2} \times 3^{2n+4}}

Step 3: Combine powers of 2 and 3

Let's combine the powers of 2:

22n+12n+2=2(2n+1)(n+2)=2n1\frac{2^{2n+1}}{2^{n+2}} = 2^{(2n+1) - (n+2)} = 2^{n-1}

Now for the powers of 3:

32n+1×3n232n+4=3(2n+1+n2)(2n+4)=3n5\frac{3^{2n+1} \times 3^{n-2}}{3^{2n+4}} = 3^{(2n+1 + n - 2) - (2n+4)} = 3^{n-5}

Step 4: Final simplified expression

The simplified expression is:

2n1×3n52^{n-1} \times 3^{n-5}

This is the final simplified result.


Would you like more details, or do you have any questions?

Related questions:

  1. How do you simplify exponents with different bases?
  2. What is the prime factorization of a number and how does it help in solving such problems?
  3. Can you provide more examples of simplifying expressions with exponents?
  4. How do you apply exponent laws when dividing powers of the same base?
  5. How do prime factorizations affect the outcome of simplifying fractions?

Tip:

When simplifying expressions with exponents, always look for opportunities to break numbers into their prime factors for easier manipulation.

Ask a new question for Free

By Image

Drop file here or Click Here to upload

Math Problem Analysis

Mathematical Concepts

Exponents
Simplification
Prime Factorization

Formulas

Product of powers: a^m * a^n = a^(m+n)
Division of powers: a^m / a^n = a^(m-n)

Theorems

Exponent laws: Combining powers of the same base
Prime factorization: Expressing numbers in terms of their prime factors

Suitable Grade Level

Grades 9-12