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Use the following function rule to find f(81)f(81).\newlinef(x)=12x−8f(x) = 12\sqrt{x} - 8\newlinef(81)=f(81) = _____

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Full solution

Q. Use the following function rule to find f(81)f(81).\newlinef(x)=12x−8f(x) = 12\sqrt{x} - 8\newlinef(81)=f(81) = _____
  1. Identify Function and Input: Identify the function and the input value.\newlineWe are given the function f(x)=12x−8f(x) = 12\sqrt{x} - 8 and we need to find the value of f(81)f(81).
  2. Substitute Input into Function: Substitute the input value into the function. f(81)=1281−8f(81) = 12\sqrt{81} - 8
  3. Calculate Square Root: Calculate the square root of 8181.81=9\sqrt{81} = 9
  4. Multiply by 1212: Multiply the square root by 1212. 12×9=10812 \times 9 = 108
  5. Subtract 88: Subtract 88 from the result of Step 44.\newline108−8=100108 - 8 = 100

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