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

MCQ

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

✓
4(2 - a)
B
2(4 - a)
C
4(2 + a)
D
2(4 + a)

✓

Answer

Correct option: A.

4(2 - a)

(A)
$f(a+1)-f(a-1)$
$=4(a+1)-(a+1)^2-\left[4(a-1)-(a-1)^2\right]$
$=4(2-a)$

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