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g(-1) -> artinya x-nya diganti -1
(-1)^2+4(-1)-9
1-4+9 = 6
g(0) -> artinya x-nya diganti 0
(0)^2+4(0)-9
0+0-9 = -9
g(-1)-g(0) = 6 - (-9)
= 6+9
= 15