f(x)' = (x² - 4x)' = 2x-4
f(3) = 3²-4*3 = 9-12 = -3
f(3)' = 2*3-4 = 6-4 = 2
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f(x)' = (x² - 4x)' = 2x-4
f(3) = 3²-4*3 = 9-12 = -3
f(3)' = 2*3-4 = 6-4 = 2