Question

if X + Y is equal to 9 and X Y is equal to 20 then find X square + Y square​

Answer 1

Answer:

$x { }^{2} + y {}^{2} =( x + y) {}^{2} + 2xy$

so, (9)²+2×20=81+40=121

Answer 2

Answer:

41

Step-by-step explanation:

(x+y) = 9 , xy = 20

(x+y)^2 = 9^2

x^2 + y^2 + 2xy = 81

x^2 + y^2 + 2(20) = 81

x^2 + y^2 + 40 = 81

x^2 + y^2 = 81 - 40

x^2 + y^2= 41 (answer)