# Math Help - exponent problem

1. ## exponent problem

Hello working on this problem right here and I just can't seem to get it.

2^2x + 2^x - 12 = 0

I know the answer is ln3/ln2, but I can't figure out how to do it

2. Originally Posted by Dan1990
Hello working on this problem right here and I just can't seem to get it.

2^2x + 2^x - 12 = 0

I know the answer is ln3/ln2, but I can't figure out how to do it
The equation can be written as $(2^x)^2 + (2^x) - 12 = 0 \Rightarrow (2^x + 4)(2^x - 3) = 0$ .....

One solution is not a real number, the other is.