PLEASE HELP! Identify the y-intercept and zeros of y = {x}^(4) - 9 {x}^(2) - =3 Algebraically​

Question

PLEASE HELP!

Identify the y-intercept and zeros of

`y = {x}^(4) - 9 {x}^(2) - =3`
Algebraically​

Answer 1

y intercept: (0, -36)

zeros: 2 √ 3 , − 2 √ 3 , i √ 3 , − i √ 3