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(10 + y)² - 4y(10 + y) + y² = 52
100 + 20y + y² - 40y - 4y² + y² = 52
-2y² - 20y + =-48
2y² +20y - 48 = 0
y² + 10y - 24
(y +12) (y - 2)
y1 = 2.....x1 = 12
y2= -12...x2= -2