Question

if x^2+y^2=15 and xy=5 find value of (x+y)
please answer guys and correct please ​

Answer 1

Answer:

given :

x² +y² = 15

xy =5

using identity (a+b)² = a² +b² +2ab

(x +y)² = x² +y² +2xy

(x +y)² = 15 + 2x5

(x +y)² = 15 + 10

(x +y)² = 25

(x +y) = √(25)

(x +y) = 5