Question

if x+y=9 and xy=20; find : x-y and x2-y2​

Answer 1

Answer:

(a+b)²=a²+b²+2×ab

(9)²=a²+b²+2×20

81=a²+b²+40

81-40=a²+b²

41=a²+b²

41=x²+y²

is ur ans oky

Answer 2

Step-by-step explanation:

Just check the attachment and read carefully by checking the equations i have put goodluck for 9th