# A problem on my homework that's killing me... please help.

@dsegeneraldog (7)

United States

January 22, 2008 8:51pm CST

I've been trying it for hours now, but to no avail... I would really appreciate it if anybody could give a description (anything will help) of how to do this problem (located below.)
Well, it is....
5(3^x) = 4^x

1 response

@qbranchltd (129)

• United States

23 Jan 08

Using simple substitution I am not sure that this can be solved - unless x is a fraction. Any x on the left will result in an odd number - any x on the right will result in an even number. As I say there may be a fractional x that would change this. But if you run through the substitutions - since x must be the same on both sides - but still that does not seem to matter - unless you can come up with a result of 5(3^x) that comes up even. I don't really remember how to solve this any other way than trial and error.

@dsegeneraldog (7)

• United States

23 Jan 08

Well, actually it's one of the ones where you come up with an answer, and then you plug it into the calculator to find the accurate number, written to three digits.
I have the calculator, and all I need is how to set it up and I can get the accurate three-place decimal.... plus, once I know how to do this one, the rest will come fairly easily.
Thanks for trying, at least.
-Alex.