Question

if y+x=20 and xy=150 what is (y²+x²)

Answer 1

Answer:

y+x=20,xy = 150

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

20^2 =y^2+ x^2+2x150

400-300=y^2+ x^2

100 =y^2+ x^2

y^2+x^2 = 100.