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f(-3) = 4(-3) -1 = -13
f(-1) = 4(-1) -1 = -5
f(0) = 4(0) -1 = -1
f(2) = 4(2) -1 = 7
f(4) = 4(4) -1 = 15
f(10) = 4(10) -1 = 39