Question

Dikethui rumus suatu fungsi f(x)=5-2x,.Nilai (x+1) -f(3) =
a. 2x-4
b. 2x-3
c. 4-2x
d. 3-2x

Answer 1

(x+1) - f(3)
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