how do i solve this ...can anyone explain....
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A. f(a+b)=a^2+2ab+b^2
f(a)=a^2
f(b)=b^2
so f(a+b) no equal to f(a) + f(b)
B. f(a+b)=a+b+1
f(a)=a+1
f(b)=b+1
so f(a+b) no equal to f(a) + f(b)
C. f(a+b)=sqrt(a+b)
f(a)=sqrt(a)
f(b)=sqrt(b)
so f(a+b) no equal to f(a) + f(b)
D. f(a+b)=2/(a+b)
f(a)=2/a
f(b)=2/b
So f(a+b) no equal to f(a) + f(b)
E. f(a+b)=-3a-3b
f(a)=-3a
f(b)=-3b
So f(a+b) = f(a) + f(b) answer is E
