if f(x)=4x
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your answer will be 8- 4a
as f(a+x)-f(a-1)=4(a+1)-(a+1)^2-4(a-1)+(a-1)^2
=4a+4-a^2-1-2a-4a+4+a^2+1-2a
=8-4a
as f(a+x)-f(a-1)=4(a+1)-(a+1)^2-4(a-1)+(a-1)^2
=4a+4-a^2-1-2a-4a+4+a^2+1-2a
=8-4a
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