Question

if x-y =5 and X2+y2=53 then x2-y2=?​

Answer 1

Answer:

Correct option is B)

First we take x + y = 5

sq. on both sides

⇒(x+y)

2

=(5)

2

⇒x

2

+y

2

+2xy=25

⇒13+2xy=25[x

2

+y

2

=13](given)

⇒2xy=25−13=12

⇒xy=

2

12

=6