50 points!
What is a quartic function with only the two real zeroes given? x = 5 and x = 1

y = -x4 - 6x3 + 6x2 - 6x + 5
y = x4 + 6x3 - 6x2 + 6x - 5
y = x4 - 6x3 + 5x2 - 6x + 6
y = x4 - 6x3 + 6x2 - 6x + 5​