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(x + y - 1)² = ((x + y) - 1)² = (x + y)² - 2(x + y) + 1 =
x² + 2xy + y² - 2x - 2y + 1 = 0
x² - 2xy + y² + x² + 2xy + y² - 2x - 2y + 1 = 0
2x² + 2y² - 2x - 2y + 1= 0
2(x² - x) - 2(y - y²) + 1 = 0
b) 2x² + 2x - 2xy + y² + 1 = 0
2(x² + x) + y(y -2x) + 1 = 0
(x + y - 1)² = ((x + y) - 1)² = (x + y)² - 2(x + y) + 1 =0
x² + 2xy + y² - 2x - 2y + 1 = 0
x² - 2xy + y² + x² + 2xy + y² - 2x - 2y + 1 = 0
2x² + 2y² - 2x - 2y + 1= 0
2(x² - x) - 2(y - y²) + 1 = 0
b) 2x² + 2x - 2xy + y² + 1 = 0
2(x² + x) + y(y -2x) + 1 = 0
2x²-2xy+2y²-1=0
2)
(x-y)²+(x+1)²=0