Final answer:
The expression 3*x*x-y*y+x*x*y*y2*x*x*y*y simplifies to 4*x*x*x*x*y*y - y*y.
Step-by-step explanation:
To simplify the expression 3*x*x-y*y+x*x*y*y2*x*x*y*y, we can combine like terms.
First, let's simplify the x terms:
3*x*x + x*x*y*y2*x*x*y*y
= 4*x*x*x*x*y*y.
Next, let's simplify the y terms:
4*x*x*x*x*y*y - y*y
= 4*x*x*x*x*y*y - y*y.
This is the simplified form of the expression: 4*x*x*x*x*y*y - y*y.