Jawabanmu

2014-02-13T18:49:24+07:00
F(2x-3)=4x-7
2x-4x=-7+3
-2x=-4
x= -4/-2
= 2 

F(17) = 2 x 17 = 34 
F(7) = 2 x 7 = 14
Jawaban paling cerdas!
2014-02-13T19:02:03+07:00
Misal 2x-3 = y

2x = y + 3
x = 1/2y + 3/2
f(y) = 4(1/2y + 3/2) -7
f(y) = 2y + 6 - 7
f(y) = 2y -1
f(x) = 2x - 1
f(17) = 2.17 - 1 = 33
f(7) = 2.7 - 1 = 13
f(17) - f(7) = 33 - 13 = 20

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