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f(x) = x² + 2x
f(-1) = -1² + 2(-1) = 1 - 2 = -1
f(0) = 0² + 2(0) = 0 + 0 = 0
f(1) = 1² + 2(1) = 1 + 2 = 3
f(2) = 2² + 2(2) = 4 + 4 = 8
f(3) = 3² + 2(3) = 9 + 6 = 15
Range ( daerah hasil ) = { -1,0,3,8,15 }
yang b
( digambar yaa )
yang c
{ (-1,-1),(0,0),(1,3),(2,8),(3,15)}