Given f, of, x, equals, minus, 2, x, squared, plus, x, minus, 8f(x)=−2x 2 +x−8, find f, of, 9f(9)
Question
Given f, of, x, equals, minus, 2, x, squared, plus, x, minus, 8f(x)=−2x 2 +x−8, find f, of, 9f(9)
Solution
To find the value of f(9), you need to substitute x = 9 in the equation f(x) = -2x^2 + x - 8.
Step 1: Substitute x = 9 into the equation f(9) = -2*(9)^2 + 9 - 8
Step 2: Calculate the value f(9) = -2*(81) + 9 - 8 f(9) = -162 + 9 - 8 f(9) = -161
So, f(9) = -161.
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