X^4y^2+7x^3y^3-3xy^5+2x^2y^4 in descending powers of x

  -x^4y^2 +7x^3y^3 +2x^2y^4 -3xy^5

Step-by-step explanation:

The powers of x in the terms of the given expression are ...

  4, 3, 1, 2

so, we want to swap the last two terms to put them in the desired order:

  -x^4y^2 +7x^3y^3 +2x^2y^4 -3xy^5

step-by-step explanation:

yes it represnts a functio, their are not 2 of the same numbers on the both sides