9.4 Intro to Logarithms

​9.4 Intro to Logarithms

​In its simplest form, a logarithm answers the question:

How many of one number multiply together to make another number?

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Example: How many 2s multiply together to make 8?

Answer: 2 × 2 × 2 = 8, so we had to multiply 3 of the 2s to get 8...So the logarithm is 3

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Multiple Choice

$$\log_91=0$$

• 1

• 0

• -1

• Banana

Multiple Choice

$$\log_{\frac{1}{2}}16=-4$$

• 12

• 4

• -4

• -16

Multiple Choice

$$5^0=1$$

• $$\log_51=0$$

• $$\log_50=1$$

• $$\log_15=0$$

• Peaches

Multiple Choice

$$\sqrt[3]{64}=4$$

• $$\log_464=\frac{1}{3}$$

• $$\log_464=3$$

• $$\log_{64}4=\frac{1}{3}$$

• Llama

Multiple Choice

$$\log_{\frac{1}{3}}81$$

• -4

• 4

• 3

• 1,000,000

Multiple Choice

$$\log_{25}5$$

• -2

• 2

• 1/2

• Mullet

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