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f(x) = x^2 -3x
1→ = 1^2 -3.1= -2
2→=2^2 -3.2 = -2
3→=3^2-3.3 = 0
4→=4^2-3.4 =4
daerah hasil (-2,0,4)
f(x)=x²-3x
f(0)=0²-3(0)=0
f(1)=1²-3(1)= -2
f(2)=2²-3(2)= -2
f(3)=3²-3(3)=0
f(4)=4²-3(4)=4
R={-2,0,4}