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Maka, range:
R = {-72, -56, -27}
f(0) = 3(0)² +6(0) -72
= 0 +0 -72
= -72
f(2) = 3(2)² +6(2) -72
= 3(4) +12 -72
= 12 +12-72
= 24 -72
= -48
f(3) = 3(3)² +6(3) -72
= 3(9) +18 -72
= 27 +18 -72
= 45 -72
= -27
Jadi, range (daerah hasil) adalah = {-72, -48, -27}.
Itu jawabannya.