In this problem, you are asked to find out the roots, that is the possible values of y.
but to do so, you need an equation with one variable (y).
Equate the monomial with a constant to get the solution
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can u tell me how to solve it
can you please click a picture again such that the question above the monomial is visible, and ask it in a different question? here I am not able to understand what constant do we have to equate it to 
In this equation or problem they have asked you to find the root of the equation. They have asked you to find the variable y. You have to solve the equation to get the solution.
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