Math Problem Statement

Prove that log295.65/log270 = 1/2

Solution

We are tasked with proving that:

log295.65log270=12\frac{\log_2{95.65}}{\log_2{70}} = \frac{1}{2}

Step-by-step proof:

  1. Use the Change of Base Formula: The logarithmic identity we will use is the change of base formula: logba=logalogb\log_b{a} = \frac{\log{a}}{\log{b}} This allows us to rewrite any logarithm to a different base (in our case, the natural or common logarithm).

  2. Rewrite the expression: We rewrite the expression using natural logarithms (or any common base logarithms): log295.65log270=log95.65/log2log70/log2\frac{\log_2{95.65}}{\log_2{70}} = \frac{\log{95.65} / \log{2}}{\log{70} / \log{2}}

    The factor log2\log{2} cancels out, so this simplifies to: log95.65log70\frac{\log{95.65}}{\log{70}}

  3. Simplification using approximation: Now, let's calculate approximate values of the logarithms: log95.651.980\log{95.65} \approx 1.980 log701.845\log{70} \approx 1.845

    Now, divide the two logarithmic values: 1.9801.8451.073\frac{1.980}{1.845} \approx 1.073

    This result isn't equal to 12\frac{1}{2}, so the given expression does not seem to directly equal 12\frac{1}{2} based on standard logarithm calculations.

Analysis of Possible Error or Alternative Interpretation:

It could be that the problem expects a different interpretation, such as rounding or the use of specific values that were assumed. The exact values of 95.65 and 70 might have some context in a particular problem setup that changes the approach.

Conclusion:

Using standard logarithmic approximations, log295.65log2701.073\frac{\log_2{95.65}}{\log_2{70}} \approx 1.073, which does not equal 12\frac{1}{2}. The statement does not hold under regular logarithmic calculations.

Would you like more details on this, or have any questions?

5 related questions:

  1. What is the change of base formula in logarithms, and how is it applied?
  2. How do approximations of logarithms affect final results in mathematical proofs?
  3. How can we calculate logarithms without a calculator for small values?
  4. How does the choice of logarithmic base (e.g., base 2 or base 10) influence the result?
  5. What are some common mistakes made when working with logarithmic identities?

Tip:

Always double-check the base of the logarithm when simplifying expressions to avoid calculation errors.

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Math Problem Analysis

Mathematical Concepts

Logarithms
Change of Base Formula
Algebra

Formulas

Change of Base Formula: log_b(a) = log(a) / log(b)

Theorems

Change of Base Theorem

Suitable Grade Level

Grades 10-12