Logarithm Values 33E1Bb
1. **State the problem:** Find the values of the logarithms:
a) $\log_2 1024$
b) $\log_2 \frac{1}{4}$
c) $\log_4 8$
2. **Recall the logarithm definition and properties:**
- $\log_b a = c$ means $b^c = a$.
- Important rules:
- $\log_b (xy) = \log_b x + \log_b y$
- $\log_b \left(\frac{x}{y}\right) = \log_b x - \log_b y$
- Change of base formula: $\log_b a = \frac{\log_k a}{\log_k b}$ for any base $k$.
3. **Calculate each part:**
a) $\log_2 1024$
- Since $1024 = 2^{10}$,
- $\log_2 1024 = \log_2 2^{10} = 10$.
b) $\log_2 \frac{1}{4}$
- Note $\frac{1}{4} = 4^{-1} = (2^2)^{-1} = 2^{-2}$,
- So $\log_2 \frac{1}{4} = \log_2 2^{-2} = -2$.
c) $\log_4 8$
- Express 8 and 4 as powers of 2: $8 = 2^3$, $4 = 2^2$,
- Using change of base: $\log_4 8 = \frac{\log_2 8}{\log_2 4} = \frac{3}{2} = 1.5$.
**Final answers:**
a) 10
b) -2
c) 1.5
These results align with the properties of logarithms and the given triangles where the hypotenuse represents sums or differences of logs.