grafLangGrk0ei3sha grafLangGrk0ei3sha 24-07-2016 Mathematics contestada which function is a quadratic function? a: a(x) = –2x3 2x – 6 b: b(x) = 5x3 8x2 3 c: c(x) = –8x2 3x – 5 d: d(x) = 6x4 2x – 3