Asked by lee

what is a quartic function with only the two real zeros given
x=5 and x=1

y=-x^4-6x^3+6x^2-6x+5
y=x^4+6x^3-6x^2-5
y=x^4-6x^3+5x^2-6x+6
y=x^4-6x^3+6x^2-6x+5

can someone explain