Math Problem Statement

simplify the expression by using the definition and properties of logarithms. 2 tothepowerof log_2 5 - 3 log_5 ^3√5

Solution

To simplify the given expression:

2log253log5532^{\log_2 5} - 3 \log_5 \sqrt[3]{5}

Let's break it down step by step.

1. Simplify 2log252^{\log_2 5}:

This part involves a logarithm and an exponent with the same base. One of the properties of logarithms is:

alogax=xa^{\log_a x} = x

Using this property for 2log252^{\log_2 5}:

2log25=52^{\log_2 5} = 5

2. Simplify 3log5533 \log_5 \sqrt[3]{5}:

First, we rewrite 53\sqrt[3]{5} as an exponent:

53=51/3\sqrt[3]{5} = 5^{1/3}

Next, apply the logarithmic property:

logb(xn)=nlogbx\log_b(x^n) = n \log_b x

This gives:

log553=log5(51/3)=13log55\log_5 \sqrt[3]{5} = \log_5(5^{1/3}) = \frac{1}{3} \log_5 5

Since log55=1\log_5 5 = 1, we have:

log553=13\log_5 \sqrt[3]{5} = \frac{1}{3}

Now, multiply by 3:

3log553=3×13=13 \log_5 \sqrt[3]{5} = 3 \times \frac{1}{3} = 1

3. Final Expression:

Now that both parts are simplified, we can subtract them:

51=45 - 1 = 4

Thus, the simplified expression is:

4\boxed{4}

Would you like further details on this?

Here are 5 related questions for practice:

  1. Simplify 3log372log7743^{\log_3 7} - 2 \log_7 \sqrt[4]{7}.
  2. What is 5log5x5^{\log_5 x} for any positive xx?
  3. Simplify 4log284 \log_2 \sqrt{8}.
  4. Use properties of logarithms to simplify log3(9×27)\log_3 (9 \times 27).
  5. Solve for xx: 2log2(3x)=62^{\log_2 (3x)} = 6.

Tip: Remember that logarithmic and exponential functions are inverses of each other!

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Math Problem Analysis

Mathematical Concepts

Logarithms
Exponential Functions
Properties of Logarithms

Formulas

a^log_a x = x
log_b(x^n) = n log_b x

Theorems

Logarithmic-Exponential Inverse Theorem

Suitable Grade Level

Grades 9-11