Question

if x+y=18 xy=72 then x^2+y^2

Answer 1

Step-by-step explanation:

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

(18)^2=x^2+y^2+2(72)

x^2+y^2=-224+144

x^2+y^2=-80

Answer 2

Answer:

180

Step-by-step explanation:

here given that...

x+y=18

xy=72

we know that,

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

(18)^2=x^2+y^2+2×72

324=x^2+y^2+144

x^2+y^2=324-144=180.