Last quick question..please help! Solve 4 (^x + 7) = (^6x – 1). The options are:
x ≈ 0.04
x ≈ 28.35
x ≈ 19.51
x ≈ 0.05

Question

Last quick question..please help! Solve 4 (^x + 7) = (^6x – 1). The options are: 
		x ≈ 0.04
		x ≈ 28.35
		x ≈ 19.51
		x ≈ 0.05

anonymous · Answer

I don't understand the other side. What is 6x-1 being raised to?

anonymous · Answer

OOPS sorry : 4(^x+7) = 6(^x-1).

anonymous · Answer

(x+7) * ln(4) = (x-1) * ln(6)
x * ln(4) - x * ln(6) = -ln(6) - 7*ln(4)
x (ln(4)-ln(6)) = (-ln(6) - 7*ln(4))
x = (-ln(6)-7*ln(4))/(ln(4)-ln(6))

paxpolaris · Answer

you should write 4^(x+7) = 6^(x-1) 
just to be clear ^=‘to the power of’

anonymous · Answer

ok,sry

anonymous · Answer

what answer did u get???

anonymous · Answer

Again, you got to do the calculation. I don't have a scientific calculator on my mac.

anonymous · Answer

i got 28.35!! :)

anonymous · Answer

THANKS

paxpolaris · Answer

anonymous · Answer

Sounds about right.