Question

if x+y=8 and xy=15 find x²+y²
tell me fast....... plz​

Answer 1

Answer:

x^2 + y^2 = 34

Step-by-step explanation:

x+y=8

squaring both sides

(x+y)^2 = 64

x^2 + y^2 + 2 xy = 64

x^2 + y^2 +2(15) = 64

x^2 + y^2 = 64-30

x^2+y^2 = 34

Answer 2

Step-by-step explanation:

very simple

we know that

(x+y)² = x² + y² + 2xy

=>x²+y²=(x+y)²–2xy

=>x²+y²=(8)²–2×15

=>x²+y²=64–30

=>x²+y²=34

this is the correct answer