nish28 nish28
  • 11-02-2019
  • Mathematics
contestada

If f(1)=10 and f(n)=-5f(n-1)-2 then find the value of f(4)

Respuesta :

gmany
gmany gmany
  • 13-02-2019

Answer:

[tex]\large\boxed{f(4)=-1292}[/tex]

Step-by-step explanation:

[tex]f(n)=-5f(n-1)-2\\\\f(1)=10\\\\f(2)=-5f(2-1)-2=-5f(1)-2\\\text{put}\ f(1)=10:\\f(2)=-5(10)-2=-50-2=-52\\\\f(3)=-5f(3-1)-2=-5f(2)-2\\\text{put}\ f(2)=-52\\f(3)=-5(-52)-2=260-2=258\\\\f(4)=-5f(4-1)-2=-5f(3)-2\\\text{put}\ f(3)=258\\f(4)=-5(258)-2=-1290-2=-1292[/tex]

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