a.f(x+3)=1-((x+3)-3)2 since,f(x)=1-(x-3)2
f(x+3)=1-(x-0)2
ans :f(x+3)=1-2x
(b).f(3-x)=1-((3-x)-3)2 since ,f(x)=1-(x-3)2
f(3-x)=1-(0-x)2
ans: f(3-x)=1+2x
(c).f(2x+1)=1-((2x+1)-3)2
f(2x+1)=1-(2x-2)2
f(2x+1)=1-(4x-4)
f(2x+1)=1-4x+4
ans: f(2x+1)=5-4x
i like this question .it gives more thinking power