Question

If x-y=8and xy=5,find x 2 + y 2

Answer 1

given x - y = 8 .......... (i)

and xy = 5 --------- (ii)

squaring (i) on both sides

⇒ x² + y² - 2xy = 64 

⇒ x² + y²  = 64 + 2.5 = 74 ANSWER