Question

Si x^2 + y^2 = 52 y xy = 24 entonces el valor de (x + y) es:

Answer 1

(x + y)^2 = x^2 + 2xy + y^2

              = (x^2 + y^2) + 2xy

              = 52 + 2(24)

              = 52 + 48

(x + y)^2 = 90

x + y = √90 = √9.10

x + y = 3√10