Question

y^4+10y^2+9=0 solve this and find its roots​

Answer 1

Answer:

√-1 or √-9

Step-by-step explanation:

Let x=y²

thus the equation would be

x²+10x+9=0

x²+9x+x+9=0

x(x+9)+1(x+9)=0

(x+1)(x+9)=0

x=-1 or x=-9

x=y²

thus,

(-1)=y² or (-9)=y²

y=√(-1) or y=√(-9)