Understanding the Change of Base Formula for Logarithms

The video tutorial explains the change of base formula for logarithms, which allows the calculation of logarithms with any base using a different base. It demonstrates the application of the formula using a calculator and provides a detailed proof of the formula. The tutorial emphasizes the usefulness of the formula when calculators only support natural logarithms or log base 10.

What does the change of base formula allow you to do with logarithms?

• Solve logarithmic equations directly.

• Find the derivative of a logarithm.

• Calculate logarithms using any base.

• Convert logarithms to exponential form.

Why is the change of base formula particularly useful for calculators?

• Because it can solve logarithmic equations directly.

• Because it simplifies complex equations.

• Because it allows for faster calculations.

• Because most calculators only have buttons for natural log and log base 10.

If you want to calculate log base 3 of 25 using a calculator with only log base 10, what would you do?

• Divide log base 10 of 25 by log base 10 of 3.

• Multiply log base 10 of 25 by log base 10 of 3.

• Subtract log base 10 of 3 from log base 10 of 25.

• Add log base 10 of 25 and log base 10 of 3.

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In the proof setup, what is the new variable y defined as?

• The exponent in the equation a^y = x.

• The base of the logarithm.

• The result of the logarithm calculation.

• The coefficient of the logarithm.

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What is the initial equation set up in the proof of the change of base formula?

• a^y = x

• x^a = y

• a^x = y

• y^a = x

What is the purpose of introducing logarithm base b in the proof?

• To simplify the equation using logarithm properties.

• To eliminate the variable y.

• To convert the equation to exponential form.

• To change the base of the original logarithm.

What property of logarithms is used to simplify log base b of a^y?

• The change of base formula.

• The product rule for logarithms.

• The power rule for logarithms.

• The quotient rule for logarithms.

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CCSS.HSF.BF.B.5

After introducing log base b, what is the next step in the proof?

• Multiply both sides by log base b of a.

• Subtract log base b of a from both sides.

• Solve for y by dividing both sides by log base b of a.

• Add log base b of a to both sides.

What is the final expression for y in terms of logarithm base b?

• y = log base b of x multiplied by log base b of a.

• y = log base b of a divided by log base b of x.

• y = log base b of x divided by log base b of a.

• y = log base b of a multiplied by log base b of x.

What does the proof of the change of base formula demonstrate?

• That logarithms are always positive.

• That any logarithm can be expressed in terms of another base.

• That logarithms are only defined for positive numbers.

• That logarithms can be converted to exponential form.