Question

If x+y=15 and x2+y2=157 then find xy values?

Answer 1

x + y = 15

Square on both sides,

(x + y)² = 15²

x² + y² + 2xy = 225

Putting the given values,

157 + 2xy = 225 

2xy  = 225 - 157

2xy = 68 


xy = 68/2 

xy = 34 


i hope this will help you


-by ABHAY

Answer 2

Squaring on both sides
(X+y) ²=x²+y²+2xy
(15)²=157+2(xy)
225=157+2( xy)
225-157=2xy
68\2= (xy)

34 = xy



I hope this will help you
By DEVANSH