Question

if x+y=8 and xy=15, then x²+y²=? ​

Answer 1

◙ It is given that, ◙

x + y = 8 and xy = 15.

◙ To find ◙

The value of x² + y².

◙ Solution ◙

We know,

x² + y² = (x + y)² - 2xy

⇒x² + y² = (8)² - 2(15)

⇒x² + y² = 64 - 30

$\underline{\displaystyle{\sf{\huge\bold{\boxed{\boxed{x^2+y^2=34}}}}}}$

Answer 2

Put x = 3 and y = 5
Than x+y is 8 and xy is 15
So 9 + 25 = 34 ans
Please mark as brainliest