(9a4 + 2a2 + 5) – (16a4 – 7a2 + 1) (1 point) Responses 25a4 – 5a2 – 4 25 a 4 – 5 a 2 – 4 –7a4 – 5a2 + 6 –7 a 4 – 5 a 2 + 6 25a8 + 9a4 + 6 25 a 8 + 9 a 4 + 6 –7a4 + 9a2 + 4

25a4 - 5a2 - 4