Question

the value of x+y is__________ when x² +y²=19,xy=3​

Answer 1

Answer:

x+y=5

x² +y²=19

thus (x+y)^2-2xy=19

(x+y)^2 - 2(3)=19

(x+y)^2=25

(x+y)^2=5^2

(x+y)=5