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f(-5)=4(-5)-1=-20-1=-21
f(-3)=4(-3)-1=-12-1=-13
f(0)=4(0)-1=0-1=-1
f(2)=4(2)-1=8-1=7
f(4)=4(4)-1=16-1=15
f(10)=4(10)-1=40-1=39
no.2 rumus fungsinya kok gitu?