A) \[2(4-a)\]
B) \[4(2-a)\]
C) \[4(2+a)\]
D) \[2(4+a)\]
Correct Answer: B
Solution :
[b] \[f(x)=4x-{{x}^{2}}\] \[\Rightarrow f(a+1)-f(a-1)=\{4(a+1)-{{(a+1)}^{2}}\}\] \[-\{4(a-1)-{{(a-1)}^{2}}\}\] \[=8-\{{{(a+1)}^{2}}-{{(a-1)}^{2}}\}=8-4a=4(2-a)\]
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