f ( x )= 5x
5^x = e^{a*x} | ln ( )
x * ln ( 5 ) = a * x * ln ( e )
ln ( 5 ) = a
f ( x ) = e^{ln([5]*x)}
f(x)=3*4x
f ( x ) = 3 * e^{ln[4]*x}
f ( x ) =2 * 30,25x
30,25x = e^{a*x}
0.25 * x * ln(3) = a * x * ln(e)
a = 0.25 * ln(3)
f ( x ) = 2 * e^{0.25*ln[3]*x}
f(x) ex +e-x /2
F( x ) = e^x - 1/2 * e^{-x}