- #1
Monoxdifly
MHB
- 288
- 0
A friend asked me how to solve this question:
$$log_2(x+2)+log_{(x-2)}4=3$$
I said I had no idea because one is x + 2 and the other one is x - 2. If both are x + 2 or x - 2, I can do it. He said that if that's the case, even at his level he could solve it. This is what I've done so far regarding the question.
$$log_2(x+2)+log_{(x-2)}4=3$$
$$\frac{log(x+2)}{log2}+\frac{log4}{log(x-2)}=3$$
$$\frac{log(x+2)log(x-2)+log4log2}{log2log(x-2)}=3$$
$$log(x+2)log(x-2)+2log^22=3log2log(x-2)$$
$$log(x+2)log(x-2)-3log2log(x-2)=-2log^22$$
$$log(x-2)(log(x+2)-3log2)=-2log^22$$
What should I do from here? Or did I make some mistakes?
$$log_2(x+2)+log_{(x-2)}4=3$$
I said I had no idea because one is x + 2 and the other one is x - 2. If both are x + 2 or x - 2, I can do it. He said that if that's the case, even at his level he could solve it. This is what I've done so far regarding the question.
$$log_2(x+2)+log_{(x-2)}4=3$$
$$\frac{log(x+2)}{log2}+\frac{log4}{log(x-2)}=3$$
$$\frac{log(x+2)log(x-2)+log4log2}{log2log(x-2)}=3$$
$$log(x+2)log(x-2)+2log^22=3log2log(x-2)$$
$$log(x+2)log(x-2)-3log2log(x-2)=-2log^22$$
$$log(x-2)(log(x+2)-3log2)=-2log^22$$
What should I do from here? Or did I make some mistakes?