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d(x^2*e^x)/dx = e^x*x(x+2)
d^2(x^2*e^x)/dx = d(e^x*x(x+2)) = e^x(x^2+4x+2)
agar max y” = 0
e^x(x^2+4x+2) = 0
x^2 + 4x + 2 = 0
(x+2)^2 = 0
x = -2
max : (-2)^2*e^(-2) = 4/e^2
nilai maksimum lokal = 4/e^2
untuk nilai minimum, karna x^2*e^x non negatif, maka nilai minimumnya = 0