## anonymous 5 years ago Help! please! attach file

1. anonymous

2. anonymous

first one is 15

3. anonymous

the other is J 3

4. anonymous

can u show me step?

5. anonymous

hoe u get 3 and 15

6. anonymous

for the first one: log base 4 of 4^15 simply says: what power do you raise 4 to in order to get 4^15.

7. anonymous

And so, obviously if you raise 4 to the 15th power, you get 4^15

8. anonymous

$\text{Log}[2,9x+5]=2+\text{Log}\left[2,x^2-1\right]$$\text{Log}[2,9x+5]-\text{Log}[2,x{}^{\wedge}2-1]= 2$$\text{Log}\left[\frac{a}{b}\right]\text{= }\text{Log}[a]-\text{Log}[b]$$\text{Log}\left[2,\frac{9x+5}{x^2-1}\right]=2$$(\text{Log}[b,x]=k )\to \left(b^k= x\right)$$2^2-\frac{9x+5}{x^2-1}=0$$\frac{-9-9 x+4 x^2}{-1+x^2}=0$$\frac{((-3+x) (3+4 x))}{-1+x^2}=0$$x=3$

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