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



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

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

help_needed
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yes

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?

mukushla
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i think u got it from here :)

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

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

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and it keeps marking it wrong

help_needed
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idk what im doing wrong here

mukushla
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lemme check

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srry that shud be 12x 8

mukushla
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i got ... 12x7

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

help_needed
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thank u lol i really cant beleive i got this wrong

mukushla
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no problem ..it happens sometime :)

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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

mukushla
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ah sure :)

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Thanks im posting it as a dffnt question