SOLUTION: Add {{{ (3x^2-2xy+y^2)+(-6x^2-7xy-y^2)+(x^2+xy-4y^2) }}} please help

Question 359055: Add

please help
Found 2 solutions by Fombitz, ewatrrr:
Answer by Fombitz(32388) (Show Source): You can put this solution on YOUR website!
You can only add like terms.

Complete the calculation to get the solution.

Answer by ewatrrr(24785) (Show Source): You can put this solution on YOUR website!

Hi,

Adding by combining like terms

or
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