Add the following polynomails -3x^2-2xy+y^2,-4x^2-xy+6y^2, x^2+6xy-y^2

When we add the given polynomials the result is

Step-by-step explanation:

Given polynomials are

, ,

Now addding the polynomials we get

 (adding the like terms on RHS)

 (taking 3 outside on RHS)

Rewritting the above equation we get,

Therefore

When we add the given polynomials the result is

step-by-step explanation:

descending order means to order the polynomials from the term with the largest exponent to the term with the smallest exponent.  

therefore, the correct answer is d.