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help_needed

Find the linearization L(x) of the function at a. f(x) = x^4 + 4x^2, a = −1

  • one year ago
  • one year ago

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

    • one year ago
  2. mukushla
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    is this right? \[L(x)=f(a)+(x-a)f'(a) \]

    • one year ago
  3. help_needed
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    yes

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

    • one year ago
  5. mukushla
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    i think u got it from here :)

    • one year ago
  6. help_needed
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    yeah but thats exactly what i do but the asnwer sumhow is wrong

    • one year ago
  7. help_needed
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    f(-1) = 5 and f'(-1) = -12. So it becomes 5 + -12(x+1) = -12x + 8

    • one year ago
  8. help_needed
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    and it keeps marking it wrong

    • one year ago
  9. help_needed
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    idk what im doing wrong here

    • one year ago
  10. mukushla
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    lemme check

    • one year ago
  11. help_needed
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    srry that shud be -12x -8

    • one year ago
  12. mukushla
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    i got ... -12x-7

    • one year ago
  13. help_needed
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    WOWW IM SUCHHH A FAILLURE...OK wow i cant beleive i got the calc right and algebra wrong

    • one year ago
  14. help_needed
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    thank u lol i really cant beleive i got this wrong

    • one year ago
  15. mukushla
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    no problem ..it happens sometime :)

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

    • one year ago
  17. mukushla
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    ah sure :)

    • one year ago
  18. help_needed
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    Thanks im posting it as a dffnt question

    • one year ago
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