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maka :
f(x) = x²+5x+6
f(-1) = (-1)²+5.(-1)+6 = 1-5+6 = 2
f(0) = 0²+5.0+6 = 0+0+6 = 6
f(1) = 1²+5.1+6 = 1+5+6 = 12
f(2) = 2²+5.2+6 = 4+10+6 = 20
jadi, daerah hasilnya :
{2,6,12,20}