Precalculus Examples

$\log_{3} (4) \cdot \log_{4} (5) \cdot \log_{5} (6) \cdot \log_{6} (7) \cdot \log_{7} (8) \cdot \log_{8} (9)$

Step 1

Rewrite $\log_{3} (4)$ as $\log_{3} (2^{2})$ .

$\log_{3} (2^{2}) \cdot \log_{4} (5) \cdot \log_{5} (6) \cdot \log_{6} (7) \cdot \log_{7} (8) \cdot \log_{8} (9)$

Step 2

Expand $\log_{3} (2^{2})$ by moving $2$ outside the logarithm.

$2 \log_{3} (2) \cdot \log_{4} (5) \cdot \log_{5} (6) \cdot \log_{6} (7) \cdot \log_{7} (8) \cdot \log_{8} (9)$

Step 3

Rewrite $\log_{5} (6)$ as $\log_{5} (2 (3))$ .

$2 \log_{3} (2) \log_{4} (5) \cdot \log_{5} (2 (3)) \cdot \log_{6} (7) \cdot \log_{7} (8) \cdot \log_{8} (9)$

Step 4

Rewrite $\log_{5} (2 (3))$ as $\log_{5} (2) + \log_{5} (3)$ .

$2 \log_{3} (2) \log_{4} (5) \cdot (\log_{5} (2) + \log_{5} (3)) \cdot \log_{6} (7) \cdot \log_{7} (8) \cdot \log_{8} (9)$

Step 5

Apply the distributive property.

$(2 \log_{3} (2) \log_{4} (5) \log_{5} (2) + 2 \log_{3} (2) \log_{4} (5) \log_{5} (3)) \cdot \log_{6} (7) \cdot \log_{7} (8) \cdot \log_{8} (9)$

Step 6

Apply the distributive property.

$(2 \log_{3} (2) \log_{4} (5) \log_{5} (2) \log_{6} (7) + 2 \log_{3} (2) \log_{4} (5) \log_{5} (3) \log_{6} (7)) \cdot \log_{7} (8) \cdot \log_{8} (9)$

Step 7

Rewrite $\log_{7} (8)$ as $\log_{7} (2^{3})$ .

$(2 \log_{3} (2) \log_{4} (5) \log_{5} (2) \log_{6} (7) + 2 \log_{3} (2) \log_{4} (5) \log_{5} (3) \log_{6} (7)) \cdot \log_{7} (2^{3}) \cdot \log_{8} (9)$

Step 8

Expand $\log_{7} (2^{3})$ by moving $3$ outside the logarithm.

$(2 \log_{3} (2) \log_{4} (5) \log_{5} (2) \log_{6} (7) + 2 \log_{3} (2) \log_{4} (5) \log_{5} (3) \log_{6} (7)) \cdot (3 \log_{7} (2)) \cdot \log_{8} (9)$

Step 9

Apply the distributive property.

$(2 \log_{3} (2) \log_{4} (5) \log_{5} (2) \log_{6} (7) (3 \log_{7} (2)) + 2 \log_{3} (2) \log_{4} (5) \log_{5} (3) \log_{6} (7) (3 \log_{7} (2))) \cdot \log_{8} (9)$

Step 10

Multiply $3$ by $2$ .

$(6 \log_{3} (2) \log_{4} (5) \log_{5} (2) \log_{6} (7) \log_{7} (2) + 2 \log_{3} (2) \log_{4} (5) \log_{5} (3) \log_{6} (7) (3 \log_{7} (2))) \cdot \log_{8} (9)$

Step 11

Multiply $3$ by $2$ .

$(6 \log_{3} (2) \log_{4} (5) \log_{5} (2) \log_{6} (7) \log_{7} (2) + 6 \log_{3} (2) \log_{4} (5) \log_{5} (3) \log_{6} (7) \log_{7} (2)) \cdot \log_{8} (9)$

Step 12

Rewrite $\log_{8} (9)$ as $\log_{8} (3^{2})$ .

$(6 \log_{3} (2) \log_{4} (5) \log_{5} (2) \log_{6} (7) \log_{7} (2) + 6 \log_{3} (2) \log_{4} (5) \log_{5} (3) \log_{6} (7) \log_{7} (2)) \cdot \log_{8} (3^{2})$

Step 13

Expand $\log_{8} (3^{2})$ by moving $2$ outside the logarithm.

$(6 \log_{3} (2) \log_{4} (5) \log_{5} (2) \log_{6} (7) \log_{7} (2) + 6 \log_{3} (2) \log_{4} (5) \log_{5} (3) \log_{6} (7) \log_{7} (2)) \cdot (2 \log_{8} (3))$

Step 14

Apply the distributive property.

$6 \log_{3} (2) \log_{4} (5) \log_{5} (2) \log_{6} (7) \log_{7} (2) (2 \log_{8} (3)) + 6 \log_{3} (2) \log_{4} (5) \log_{5} (3) \log_{6} (7) \log_{7} (2) (2 \log_{8} (3))$

Step 15

Multiply $2$ by $6$ .

$12 \log_{3} (2) \log_{4} (5) \log_{5} (2) \log_{6} (7) \log_{7} (2) \log_{8} (3) + 6 \log_{3} (2) \log_{4} (5) \log_{5} (3) \log_{6} (7) \log_{7} (2) (2 \log_{8} (3))$

Step 16

Multiply $2$ by $6$ .

$12 \log_{3} (2) \log_{4} (5) \log_{5} (2) \log_{6} (7) \log_{7} (2) \log_{8} (3) + 12 \log_{3} (2) \log_{4} (5) \log_{5} (3) \log_{6} (7) \log_{7} (2) \log_{8} (3)$