math
posted by Roger .
solve the following exponential equation
e^x4=e^x
please show work

if you let u = e^x,
u4 = 1/u
u^2  4u = 1
u^2  4u + 1 = 0
now just use the quadratic formula and if you get values for u, wind up with
x = ln(u) if defined
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