mbhtkn3459 mbhtkn3459
  • 08-01-2020
  • Mathematics
contestada

how do you solve: f(x) = -x2e-x
+2xe-x , finding the zero's of f.

Respuesta :

lisboa lisboa
  • 09-01-2020

Answer:

0 and 2

Step-by-step explanation:

[tex]f(x) = -x^2e^{-x}+2xe^{-x}[/tex]

To find zeros set f(x)=0  and solve for x

[tex]0 = -x^2e^{-x}+2xe^{-x}[/tex]

[tex]0 = -e^{-x}(x^2-2x)[/tex]

now factor out x

[tex]0 = -xe^{-x}(x-2)[/tex]

set each factor =0 and solve for x

[tex]x=0[/tex]

[tex]-e^{-x}=0[/tex] no solution for x

[tex]x-2=0, x=2[/tex]

zeros of f  are 0 and 2

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