Ola renan

(x - y)² = x² - 2xy + y²

x² + y² = (x - y)² + 2xy

x² + y² = 100 + 2*27 = 154

pronto

xy = 27

y= 27/x

x - 27/x = 10

27x - 27 = 10x

17x = 27

x = 27/17

logo

y = 17

logo x^2 + y^2 =

(27/17)^2 + (17^2)