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b = 0
f(a) = -2x + b = 4
f(b) = b = 0
f (-6)=> -6a+b = 12 _ dikurangi menjadi
4a = -8
a =-2
2a+b=4
2(-2) +b = 4
-4 + b = 4
b = 4+4
b = 8
nilai a=-2 dan b= 8
rumus fungsi
f(u) = -2u+8