+0  
 
0
364
3
avatar+30 
solve
3^-x+4=71
x=
malvelous  Feb 13, 2012
 #1
avatar+3076 
0
[input]3^-x+4=71[/input]

3^-x=67
assuming x>0
ln( 3^-x ) = ln(67)
-x*ln(3) = ln(67)
-x=ln(67)/ln(3)
x=-ln(67)/ln(3)
admin  Feb 13, 2012
 #2
avatar+30 
0
No maybe this will help

3^(-x+4)=71
malvelous  Feb 13, 2012
 #3
avatar+3076 
0
[input]3^(-x+4)=71[/input]
admin  Feb 13, 2012

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