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The parabola f(x) = x^2 - 4x takes equal values at 0 and 4. Rolle's point c is
A3
B1
C2
D4
Answer & Solution
Correct answer: C. 2
Since f(0) = f(4) = 0, and f'(x) = 2x - 4 vanishes at x = 2.
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