Question

if x - y = 9 and xy= 2 , find the value of (x2 + y2) ​

Answer 1

Answer:

77

Step-by-step explanation:

x - y = 9

xy = 2

for x-y=9

squaring on both sides

(x-y)²=9²

x²+y²-2xy=81

x²+y²-2(2)=81 because xy=2

x²+y²= 81-4

x²+y²=77