Question

Find the linearization L(x) of the function at a.

f(x) = x^4 + 4x^2, a = −1

Answer 1

I keep getting F(x) = f(x) = -12x - 8 as my asnwer but it's wrong :(

Answer 2

is this right?
\[L(x)=f(a)+(x-a)f'(a) \]

Answer 3

yes

Answer 4

so we have a=-1 and\[L(x)=f(-1)+(x+1)f'(-1)\]how about this one ? make sense?

Answer 5

i think u got it from here :)

Answer 6

yeah but thats exactly what i do but the asnwer sumhow is wrong

Answer 7

f(-1) = 5 and f'(-1) = -12. So it becomes
5 + -12(x+1) = -12x + 8

Answer 8

and it keeps marking it wrong

Answer 9

idk what im doing wrong here

Answer 10

lemme check

Answer 11

srry that shud be -12x -8

Answer 12

i got ... -12x-7

Answer 13

WOWW IM SUCHHH A FAILLURE...OK wow i cant beleive i got the calc right and algebra wrong

Answer 14

thank u lol i really cant beleive i got this wrong

Answer 15

no problem ..it happens sometime :)

Answer 16

ok but this one its not about the algebra. Im just cnfused how to do it. Do u mind helping if i post it

Answer 17

ah sure :)

Answer 18

Thanks im posting it as a dffnt question