Math Problem Statement

Simplify the expression: \( \frac{1}{2} \log(32) + \frac{1}{2} \log\left(\frac{1}{128}\right) + 2 \log(\sqrt{8}) \)

Solution

The given expression appears to be:

12log(32)+12log(1128)+2log(8)\frac{1}{2} \log(32) + \frac{1}{2} \log\left(\frac{1}{128}\right) + 2 \log(\sqrt{8})

Let me solve it step by step.

Step 1: Simplify the logarithmic terms

We will simplify each logarithmic term individually.

  • 12log(32)\frac{1}{2} \log(32): Using the property log(ab)=blog(a)\log(a^b) = b \log(a), we get:

12log(32)=log(32)\frac{1}{2} \log(32) = \log(\sqrt{32})

Now, 32=42\sqrt{32} = 4\sqrt{2}, so:

log(32)=log(42)=log(4)+log(2)=log(4)+12log(2)\log(\sqrt{32}) = \log(4\sqrt{2}) = \log(4) + \log(\sqrt{2}) = \log(4) + \frac{1}{2} \log(2)

Thus, 12log(32)\frac{1}{2} \log(32) simplifies to:

2log(2)+12log(2)=2.5log(2)2 \log(2) + \frac{1}{2} \log(2) = 2.5 \log(2)

  • 12log(1128)\frac{1}{2} \log\left(\frac{1}{128}\right): Using the quotient property log(ab)=log(a)log(b)\log\left(\frac{a}{b}\right) = \log(a) - \log(b) and simplifying 1128\frac{1}{128} as 1281128^{-1}, we get:

12log(1128)=12log(1281)=12log(128)\frac{1}{2} \log\left(\frac{1}{128}\right) = \frac{1}{2} \log(128^{-1}) = -\frac{1}{2} \log(128)

Now, 128=27128 = 2^7, so:

12log(128)=12log(27)=127log(2)=72log(2)-\frac{1}{2} \log(128) = -\frac{1}{2} \log(2^7) = -\frac{1}{2} \cdot 7 \log(2) = -\frac{7}{2} \log(2)

  • 2log(8)2 \log(\sqrt{8}): We know 8=22\sqrt{8} = 2\sqrt{2}, so:

2log(8)=2log(22)=2(log(2)+log(2))=2log(2)+212log(2)2 \log(\sqrt{8}) = 2 \log(2\sqrt{2}) = 2 (\log(2) + \log(\sqrt{2})) = 2 \log(2) + 2 \cdot \frac{1}{2} \log(2)

This simplifies to:

2log(2)+log(2)=3log(2)2 \log(2) + \log(2) = 3 \log(2)

Step 2: Combine all terms

Now, we add all the simplified terms together:

2.5log(2)72log(2)+3log(2)2.5 \log(2) - \frac{7}{2} \log(2) + 3 \log(2)

This simplifies to:

2.5log(2)3.5log(2)+3log(2)=2.0log(2)2.5 \log(2) - 3.5 \log(2) + 3 \log(2) = 2.0 \log(2)

Step 3: Final answer

So, the entire expression simplifies to:

2log(2)2 \log(2)

This is the final simplified result.

Would you like further details or any clarification?


Here are five related questions to deepen your understanding:

  1. How would the result change if the base of the logarithms was not 10?
  2. Can you apply logarithmic properties to solve this expression using a different method?
  3. What is the numeric value of the simplified expression 2log(2)2 \log(2)?
  4. How would you solve this if the numbers involved were not powers of 2?
  5. Can you graph the logarithmic function for the components of the expression?

Tip: Always check if you can use properties of logarithms (like the power rule or quotient rule) to simplify expressions before performing calculations!

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Math Problem Analysis

Mathematical Concepts

Logarithms
Algebra
Properties of Logarithms

Formulas

Logarithm product rule: \( \log(a) + \log(b) = \log(ab) \)
Logarithm power rule: \( \log(a^b) = b \log(a) \)
Logarithm quotient rule: \( \log\left(\frac{a}{b}\right) = \log(a) - \log(b) \)

Theorems

Properties of logarithms
Exponent laws

Suitable Grade Level

Grades 10-12