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(3a²+a²)+(-2ab-2ab)+(b²+3b²)=
4a²-4ab+4b²
2. x²-2x-3 -(2x²+3x)=
x²-2x-3-2x²-3x=
(x²-2x²) + (-2x-3x) -3=
-x²-5x-3
3. 2x²-2xy-y² -(x²+4xy-8y²)=
2x²-2xy-y²-x²-4xy+8y²=
x²-6xy+7y²