anonymous
  • anonymous
Evaluate the function for the given value of x. If you can explain how you got the answer that would be great! :D f(x) = -6x2 - 4x - 4 , x = - 2
Mathematics
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SOLVED
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katieb
  • katieb
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hartnn
  • hartnn
directly put x=-2 f(-2)= -6 (-2)^2 -4(-2) -4 now (-2)^2 = (-2)(-2) =4 4(-2)=-8 so, f(-2) =-6(4)-(-8)-4 =-24+8-4 i think u can solve further
anonymous
  • anonymous
|dw:1348382774561:dw|
anonymous
  • anonymous
so f( - 2) = -20

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hartnn
  • hartnn
yup.
anonymous
  • anonymous
the 20 has a negative sign its not positive
hartnn
  • hartnn
yes, its -20 only.
anonymous
  • anonymous
Okay yeah I see I was like It can't be positive 20. :D
jwheele1
  • jwheele1
Do you understand?
anonymous
  • anonymous
Yes I do actually thats why I was like this can't be positive 20 lol
jwheele1
  • jwheele1
ok, great. Just wanted to make sure before I left this area. =)
jwheele1
  • jwheele1
I'll leave you all with this: http://www.khanacademy.org/math/algebra/quadtratics

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