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If f(x) = 4x - x^2, then f (a + 1) - f( ...

If `f(x) = 4x - x^2`, then `f (a + 1) - f( a - 1)` =

A

4 ( 2 - a)

B

2 ( 4 - a)

C

4( 2 + a)

D

2( 4 + a)

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A
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