Question

x² + y² = 101 e xy = 10, qual o valor de (x - Y)² e x - y ?

Answer 1

X² + y² = 101 e xy = 10, qual o valor de

(x - y)²  = x² - 2xy + y² ==> (x² + y²) - 2.xy ==> 101 - 2.10 ==> 101-20 ==> 81  

 x - y