Integers and fractions

Question

I just solved a math problem about absolute maximum and absolute minimum, but the problem is that my professor wants the answer as an integer or a fraction not decimal. These are the solutions below:

f(x)=(-1)^3e^(-1)=-0.367879441

f(x)=(0)^3e^(0)=0

f(x)=(1)^3e^(1)=2.718281828

Answer 1

Assuming f(x) = x³e^x

f'(x) = (e^x)(x²)(x + 3)

Local and global minium at x = -3

f(-3) = -27 / e³