Trouble solving derivative

  • Thread starter bk1
  • Start date
  • #1
bk1
1
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Hi everyone,

I'm having trouble solving this one. I just don't really see what i'm doing wrong.

Homework Statement


X² - x - 2
X² + 5x + 6


Homework Equations





The Attempt at a Solution


(( x-1 ) * x² + 5x + 6 ) - (( x + 5 ) * x²-x-2 )
( x² + 5x + 6)²

So 8x² -6x-16
(x² + 5x + 6)²

Now I know this isn't the correct awnser. Because it should say
6x² + 16x + 4
( x² + 5x+6)²

Could anyone point out to me what i'm doing wrong?
Thanks in advance.
Tim
 

Answers and Replies

  • #2
97
1


The derivative of x^2 is 2x, not x.
 

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