Question

06)Sabendo que x2 + y2 = 74 e xy = 35, calcule o valor de (x – y)².


a)4

b)70

c)74

d)109

Answer 1

(x-y)² = x²+y² - 2.xy

(x-y)² = 74 - 2.35

(x-y)² = 74 - 70

(x-y)² = 4