# How do you find the power series for #f(x)=e^(-4x)# and determine its radius of convergence?

# e^(-4x) = 1 - 4x + 8x^2-32/3x^3 + 32/3x^4 + ... #

# " " = sum_(n=0)^oo (-4x)^n/(n!) " " AA x in RR#

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