log(base 2) (x+4) + log(base 2) (x+8)=5
Here's my work:
log(2) (x+4)(x+8)=10
x^2+12x+22=0
(x+11) (x+2)
-11,-2-->Answers
But my teacher said you don't use negative numbers, so what's my answer?
And, I don't know how to do this problem:
log(base 5)(2x+4) - log(base 5)(x-1)=1
My work:
log5 2(x+2)/(x-1)=5
Then what?
I was paying attention and I promise you that is exactly what he said. I even have a problem he did on the board and he multiplied the log base and the answer given. In fact, he never did a formal lecture, just skimmed over the homework and did a few problems.
I think I get it...
Thanks.