Question

find the value
of x² + y² , if
x+y=15 and xy = 10​

Answer 1

Answer:

Given = x + y= 10

X- y = 15

Now, squaring eq 1 & 2

X² + Y ² + 2XY = 100

X² + Y² - 2XY = 225

ADDING BOTH OF THEM

2( X² + Y²) = 325

HENCE, X² + Y² = 325/2