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x+1 - ( 5-2(3)
x+1 - 5 +6
x+2
valid
bagiamana klu soalnya ditanya begini
f(x+1) - f(3)
misal t=x-1
maka
x= t+1
f(x+1) = 5-2x
f(x)= 5-2(t-1)
= 5-2t-2
= 3-2t
f(x)= 3-2x
f(3)= 5-2(3)=-1
jadi
f(x+1)-f(3)= 3-2x-(-1)
= 3-2x+1
= 4-2x jawaban C