Question

what is the value of x2+y2÷2xy where x+y=9 and x-y=5​

Answer 1

Answer:

53/28 =1.8928...

Step-by-step explanation:

x + y = 9;

x - y = 5; Add both lines to eliminate y:

2x = 14 ;

=> x =14/2= 7;

=> 7 + y = 9;

=> y = 2; =>

x^2+y^2 = 49 +4 = 53;

2xy = 2*7*2=28

=> (x^2+y^2) ÷2xy = 53/28 =1.8928...