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# core ln question Watch

1. why is 2ln4-2ln2=ln4

i know its ln16/ln4.

but how does ln/16 = ln4

you cant simply devide 16/4 normally as ln10/ln2 does not = ln5

2. (Original post by uxa595)
why is 2ln4-2ln2=ln4

i know its ln16/ln4.

but how does ln/16 = ln4

you cant simply devide 16/4 normally as ln10/ln2 does not = ln5
3. (Original post by uxa595)
why is 2ln4-2ln2=ln4

i know its ln16/ln4.

but how does ln/16 = ln4

you cant simply devide 16/4 normally as ln10/ln2 does not = ln5
You're getting the rules mixed up. (See Spungo's post above ^^^)

2ln(4) - 2ln(2)
= ln(4^2) - ln(2^2)
= ln(16) - ln(4)
= ln(16/4)
= ln(4)

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Updated: December 13, 2010
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