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Answer:
x^2 - 3y^2 + 4y - 2x + 5.
Step-by-step explanation:
x^2 - y^2 + 3y - 5 - (2y^2 + 2x - y - 10)
= x^2 - y^2 + 3y - 5 - 2y^2 - 2x + y + 10
= x^2 - y^2 - 2y^2 + 3y + y - 2x - 5 + 10
= x^2 - 3y^2 + 4y - 2x + 5.