If x-y = 7 and xy = 9, Find the value of (x^2+y^2). Explain it.
Hi Alankrit!
It is known that (x – y)2 = x2 + y2 – 2xy
⇒ 72 = x2 + y2 – 2 × 9
⇒ x2 + y2 = 49 + 18 = 67
Thus, the value of the expression x2 + y2 is 67.
Hope! This will help you.
Cheers!!!