2a)
e^{x+1} = 9
x+1 = ln9
x= ln9-1
2g)
5*3^{x+2} = 7*2^x
5*3^x*3^2 = 7*2^x
(3/2)^x = 7/45
x = ln (7/45)/ln(2/39
2h)
e^-x = 2^3x
-x = ln2^3x = 3x*ln2
3xln2+x = 0
x(3ln2-1) = 0
x = 0
3a)
e^x = z
z^2-3z+2 =0
(z-1)(z-2) =0
z1 = 1 ---> e^x = 1 --> x1= 0
z2= 2 ---e^x = 2 ---> x2 = ln2