Posted by **Jus** on Monday, May 25, 2009 at 5:38pm.

1. Given the product law of logarithms, prove the product law of exponents.

2. Given the quotient law of logarithms, prove the quotient law of exponents.

3. Apply algebraic reasoning to show that

a=b^(loga/logb) for any a,b>0

Please explain these to me.

All I know is that

The product law of logs are:

Log(AB)=logA+logB

The Quotient law of logs are:

Log(A/B)=logA-Logb

- Math -
**Reiny**, Monday, May 25, 2009 at 5:55pm
1.

let a^x =m and a^y = n

by definition:

a^x = m <---> log _{a} m = x and

a^y = n <---> log _{a} n = y

just for the fun of it, I am going to add the two equations on the right ...

log _{a} m + log _{a} n = x+y

or log _{a} mn = x+y, since we are supposed to know the product rule of logs

but that can be changed to

a^(x+y) = mn

but what was m and n ??

so (a^x)(a^y) = mn = a^(x+y)

which is "product law of exponents"

Q.E.D.

- Math -
**Jus**, Monday, May 25, 2009 at 6:18pm
thank you

could you help me with part 3 too?

I know that part two is the same as part one except you divide. please help with part 3, thank you in advance reiny

- Math -
**Reiny**, Monday, May 25, 2009 at 6:29pm
one of the log rules states

log _{b} a = loga/logb ...(base 10, or any other legal base you want to choose)

so again by definition of the log notation

a=b^(loga/logb) for any a,b>0

<-----> log _{b} a = loga/logb

well, well, that was even easier than the first one.

let's test it

let a = 8 and b=2

we know log _{2} 8 = 3

and log8/log2 = .903089987/.301029995 = 3

- Math -
**Nora Escobedo**, Tuesday, October 11, 2011 at 2:01am
Which expression eqivalent to 27x^-2y^6/3x^5y^2z^9?

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