no to both answers
1. f(x) = x^2 + 2x , g(x) = 1/x
= (1/x)^2 + 2(1/x) = 1/x^2 + 2/x or (1+2x)/x^2
the way you typed it, ...
3^x - 1 = 10
3^x = 11
x = ln11/ln3 = 2.182658
If you meant to type
3^(x-1) = 10
x-1 = ln10/ln3
x = ln10/ln3 + 1
3. Again I don't think you meant what you typed
Was it 3^(x+2) - 4 = 12 ???
if so then ...
3^(x+2) = 16
x + 2 = ln16/ln3
x = ln16/ln3 - 2 = .5237
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