Question

if x+y= 10 and xy=21find the value of x3 +y3​

Answer 1

Answer:

(x+y)^3=x^3+y^3+3xy(x+y)

(10)^3=x^3+y^3+3(21)(10)

1000=x^3+y^3+630

1000-630=x^3+y^3

370=x^3+y^3