diketahui f (2x - 3) = 4x - 7 , maka nilai dari f(17) - f(7) adalah.. ?

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

y = 2x -3
2x = y + 3
x = y/2 + 3/2
f(x) = 4(x/2 + 3/2) -7
f(x) = 2x + 6 -7
f(x) = 2x -1
f(17) = 2(17) - 1 = 34 -1 =33
f(7) = 2(7) - 1 =14 -1 =13
f(17) - f(7) = 33 -13 = 20