(2x²-6xy+y²)+(-6x²-5xy-y²)+(x²+xy-7y²)

Question

I forgot how this was supposr to be added together.

Answer 1

(2x² - 6xy + y²) + (- 6x² - 5xy - y²) + (x² + xy -7y²)

= 2x² - 6xy + y² - 6x² - 5xy - y² + x² + xy - 7y²

Now it might help to rearrange the equation a little bit to make it easier to see what to add:

= 2x²- 6x²+ x² + y² - y² - 7y² - 6xy - 5xy + xy

= - 3x² - 7y² - 10xy                 

This is the final simplified equation.

Answer 2

x²-y√xy=36

y²-x√xy=72