Jawabanmu

2014-08-30T21:06:25+07:00
F(2x-3) = 4x - 7
f(17)
f(2.17-3) = 4x - 7
f(34-3) = 4x - 7
f(31) = 4.31 - 7
f(31) = 134 - 7
f(31) = 117

f(7)
f(2.7-3) = 4x - 7
f(14-3) = 4x - 7
f(11) = 4.11 - 7
f(11) = 44 - 7
f(11) = 37

(f(17)atau f(31)) - (f(7) atau f(11))
117 - 37 = 80

mohon maklum jika salah
2014-08-30T21:06:59+07:00
F(2x-3)= 4x-7
f(17)= ...
2x-3=17
2x = 20
x= 10
f(17)= 4x10 - 7 = 33

f(7) = ...
2x-3=7
x= 10
x= 5
f(7) = 4x5 -7 = 13

f(17)-f(7)= 33-13 = 20
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