Decide which of the following are quadratic equations :
`y^(2)+(1)/(y)=2`

Explanation

`y^(2)+(1)/(y)=2`
Multiplying the equation by y,
`y^(3)+1=2y" ":.y^(3)-2y+1=0`
In this equation, the highest index of variable y is 3 and not 2.
`:.` the given equation is not a quadratic equation.