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x = 1 maka f(5) = 6(1) + 5 = 11
x = - 1/2 maka f(2) = 6(-1/2) + 5 = 2
sehingga
f(5) - f(2) = 11 - 2 = 9
f (5) = f(2(1) +3). maka x=1
untuk x=1 maka:
6x + 5
6(1) +5 =11
f (2) = f (2(-1/2) +3 ) maka x =-1/2
untuk x=-1/2, maka :
6x+5
6(-1/2) + 5 = 2
f(5)-f(2) = 11- 2 = 9
semoga bermanfaat