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The function f(x) = x^2 - 6x + 5 is strictly decreasing on the interval
A(-infinity, 3)
B(-infinity, -3)
C(3, infinity)
D(0, infinity)
Answer & Solution
Correct answer: A. (-infinity, 3)
f'(x) = 2x - 6 is negative exactly when x is less than 3.
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