Question

If (x + y) = 9 and xy = 20, then find the value of x2 + y2​

Answer 1

Answer:

18

Step-by-step explanation:

consider x=5,y=4

then (5+4)=9

5×4=20

so,

x2 + y2 is (5×2 + 4×2) = 18

Answer 2

Answer:

41

Step-by-step explanation:

we know that,

x^2 + y^2 = (x+y)^2 -2.xy

Now,

x^2+y^2 =(9)^2 - 2.20

x^2 + y^2 = 81 - 40

41 ans #