Use change of base to rewrite the expressio: log7 25
I wrote:
7^x = 25
Is this correct?
Second question:
Simplify x^2-2x-15/(x-6)(x-3) * x^2-6/(x-5)
Any ideas or help?

Question

Use change of base to rewrite the expressio: log7 25
I wrote:
7^x = 25
Is this correct?
Second question:
Simplify x^2-2x-15/(x-6)(x-3) * x^2-6/(x-5)
Any ideas or help?

anonymous · Answer

change of base 
$$\log_7(25)=\frac{\ln(25)}{\ln(7)}$$ what you did was write it in equivalent exponential form

anonymous · Answer

So what you wrote exactly would be the right answer?

anonymous · Answer

no

anonymous · Answer

question asks for change of base, but they didn't specify the base ( or if they did, i can't see it)

anonymous · Answer

the first one, you are right.
second:|dw:1375842465299:dw|