anonymous
  • anonymous
find f'(-3), if f(x)=(2x^2-7x)(-x^2-7). round your answer to the nearest integer
Mathematics
schrodinger
  • schrodinger
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Loser66
  • Loser66
just expand f(x) take derivative replace x =-3 in its derivative Done
anonymous
  • anonymous
ok but I end up with a really bigggggggggg number
Loser66
  • Loser66
Show your work, please

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anonymous
  • anonymous
ok here: f(-3)=(2(-3)^2-7(-3))(-(-3)^2)) f(-3)=-624 I know I did something wrong
Loser66
  • Loser66
hey, your question is to find \(f'(-3)\) not \(f(-3)\)
Loser66
  • Loser66
\(f(x) = (2x^2-7x)(-x^2-7)\) Use FOIL to expand it, what do you have?
anonymous
  • anonymous
-2x^4+49x
Loser66
  • Loser66
Nope |dw:1438996954403:dw|
Loser66
  • Loser66
|dw:1438997014846:dw|
Loser66
  • Loser66
Now, take derivative one by one, what do you get?
anonymous
  • anonymous
a 2.
Loser66
  • Loser66
I try to help but I need you help yourself also. I don't understand your comment.

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