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Given f(x)=-x^(2)-9x, find f(4) Answer:

Given f(x)=−x2−9x f(x)=-x^{2}-9 x , find f(4) f(4) \newlineAnswer:

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Full solution

Q. Given f(x)=−x2−9x f(x)=-x^{2}-9 x , find f(4) f(4) \newlineAnswer:
  1. Substitute xx with 44: We have the function f(x)=−x2−9xf(x) = -x^2 - 9x. To find f(4)f(4), we need to substitute xx with 44 in the function.
  2. Calculate f(4)f(4): Substitute xx with 44 in the function: f(4)=−(4)2−9(4)f(4) = -(4)^2 - 9(4).
  3. Add values for f(4)f(4): Calculate the value of f(4)f(4): f(4)=−16−36f(4) = -16 - 36.
  4. Add values for f(4)f(4): Calculate the value of f(4)f(4): f(4)=−16−36f(4) = -16 - 36. Add the values to get the final result: f(4)=−16−36=−52f(4) = -16 - 36 = -52.

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