Question

What is a quartic function with only the two real zeroes given?
x = –1 and x = –3

y = x4 –4x3 – 4x2 – 4x – 3
y = –x4 + 4x3 + 4x2 + 4x + 3
y = x4 +4x3 + 3x2 + 4x – 4
y = x4 + 4x3 +4x2 +4x +3

Answer 1

I think it is the 3rd one, am I right?

Answer 2

I don't think -1 is a zero of the third one.

Answer 3

so then is it the last one? I'm stumped

Answer 4

I think it is the last one. It is the only when where you get 0 when you plug in -1 and -3

Answer 5

thank you

Answer 6

yw