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x^2 + 2xy -2x + 2xy + 4y^2 - 4y - 2x - 4y + 4
x^2 + 4y^2 + 4xy - 4x - 8y + 4
2. (sama kayak di atas)
4p^2 + 9y^2 + 6py - 40p - 60y + 100
3. 9a^2 + 4b^2 + 6ab + 12a + 8b + 4
4. 25a^2 - b^2 - 5ab + 20a - 4b