Question

MEDAL AND FAN!!! Please help last one!
The following function defines a recursive sequence:
f(0) = -2
f(1) = 8
f(n) = -4*f(n-1)-3*f(n-2); for n >1
Which of these sequences is defined by this recursive function?
a) -2,8,-26,-80, ...
b) -2,8,-26,80, ...
c) -2,12,-44,180, ...
d) -2,-12,-44,-180, ...

Answer 1

@hartnn I think it is b am i right?

Answer 2

have you ever use freemathhelp.com before

Answer 3

No I have not.

Answer 4

if you plug in n=3
you get f(3) = -26

plug in n=4,
what u get f(4) as ?
80 or -80 ?

Answer 5

80

Answer 6

wait...

Answer 7

it would be -80 then.

Answer 8

f(4) = -4 f(3) -3 f(2)

Answer 9

oh, you don't need f(4), you need f(3)

Answer 10

f(3) = -4 f(2) -3 f(1)

Answer 11

= -4 (-26) -3 *8
=...

Answer 12

104-24=90 :3

Answer 13

so I was right it was b :D

Answer 14

80
yes, B is correct :)

Answer 15

=80**

Answer 16

Thank you so much <3 your the bestest!!!

Answer 17

you are more bester than me :P

Answer 18

<3