Jawabanmu

2014-05-22T21:05:35+07:00
F(2x-3)=4x-7

17=2x-3
17+3=2x
20=2x
10=x
f(17)=4.10-7
      =40-7=33

7=2x-3
7+3=2x
10=2x
5=x
f(7)=4.5-7
     =20-7
     =13
f(17)-f(7)=33-13=20
f(2x-3)=4x-7
misal y=2x-3
x=y+3/2

f(y)=4(y+3/2)-7=2y+6-7=2y-1
f(x)=2x-1
f(17)-f(7)=2(17)-1-(2(7)-1)=20