anonymous
  • anonymous
Let the function f(x) be defined by the equation y = f(x), where x and f(x) are real numbers. f(x) = 4 − x^2 f(9) = f(-7) = f(k) = f(k2 − 8) =
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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schrodinger
  • schrodinger
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anonymous
  • anonymous
f(9)=-77 f(-7)=-45 f(k)=4-k^2
anonymous
  • anonymous
i'm not sure about the last one, sorry
anonymous
  • anonymous
no worries.. how did you get -77? I want to try and understand this

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anonymous
  • anonymous
Just put in 9 to the equation so f(9)=4-9^2
anonymous
  • anonymous
Last one is 2k-8? or k^2-8?
anonymous
  • anonymous
i got it.. i was trying to multiply it instead of subtracting it...
anonymous
  • anonymous
:)
anonymous
  • anonymous
andras 2k-8 nor k^2-8 are correct for the final answer ive tried them
anonymous
  • anonymous
hmm, but my question was what is k2 here: f(k2 − 8)
anonymous
  • anonymous
\[ f(k^2 − 8) = \] is the equation
anonymous
  • anonymous
u just have to put k^2-8 into the function. So it will be f(k^2-8)= 4-(k^2-8)^2=-k^2+16k-60
anonymous
  • anonymous
and I guess k is just a free parameter here

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