Am I setting this problem up correctly?

Solve 3^x-4 = 7^ x+9

(x - 4) log 3 = (x + 9) = log 7

Question

Am I setting this problem up correctly?

Solve 3^x-4 = 7^ x+9

(x - 4) log 3 = (x + 9) = log 7

anonymous · Answer

huh :(

anonymous · Answer

i got 12...

anonymous · Answer

x = 4 In (3) + 9 In (7)/In (3) - In (7)

anonymous · Answer

THANK YOU FOR THE STEPS!!!!!!!!!!!!!!!!!!

anonymous · Answer

but i still got 12

anonymous · Answer

i used the calc magic and let me just tell you this....there was no magic!!!!!!!

anonymous · Answer

@Luis_Rivera

amistre64 · Answer

(x - 4) log 3 = (x + 9) log 7

xL3 - 4L3 = xL7 + 9L7

xL3 - xL7 = 4L3 + 9L7

x(L3 - L7) = 4L3 + 9L7



       4L3 + 9L7
x = ----------
         L3 - L7

anonymous · Answer

where did L come from???????????????????

anonymous · Answer

oh Log:)

amistre64 · Answer

im sure it can be cleaned up a little more, but thats the gist of it .... and yes, L for log

anonymous · Answer

2.38061585769

anonymous · Answer

https://www.google.com/#hl=en&sclient=psy-ab&q=4+log+3+log+9+log+7+divided+by+log+3+-+log+7&oq=4+log+3+log+9+log+7+divided+by+log+3+-+log+7&gs_l=hp.3...1407.21468.2.21687.34.30.4.0.0.0.539.4303.10j15j3j5-1.29.0.les%3B..0.0...1c.1.5.psy-ab.f6rX2gU958k&pbx=1&bav=on.2,or.r_cp.r_qf.&bvm=bv.43287494,bs.1,d.eWU&fp=6edb92b21f21fec&biw=1366&bih=667

amistre64 · Answer

... mine says -25.86 or so

amistre64 · Answer

3^x-4 = 7^ x+9

those are exponents right?

amistre64 · Answer

http://www.wolframalpha.com/input/?i=3%5E%28x-4%29+%3D+7%5E%28x%2B9%29

anonymous · Answer

love u