1. Logarithms (2)
Laws of logarithms

2. Activity 1 a + b = c Log28 + log216 = log2 (8 x 16) Find a, b and c
Log28 = a
Log216 = b
Log2128 = c
How are a, b and c related?
Write in the form 2a x 2b = 2c
a b = c
Log log216 = log2 (8 x 16)

3. Laws of logarithms
The following laws can be shown using our laws of indices

4. Examples
Write the following using a single logarithm:

5. Activity 2
WE MUST BE ABLE TO
REPRODUCE THE PROOF
OF EACH OF THE THREE
LAWS OF LOGARITHMS.
ONE of the three
WILL be examined at C2