Question

X2+y2=65 then x3+y3=?​

Answer 1

Answer:

Step-by-step explanation:

(x +y)³= x³ +y³ +3xy (x +y)

(x+y)³ -3xy(x+y) = x³ + y³

(x+y) [( x+y )² -3xy] = x³+y³

(x+y) [x²+y²+2xy-3xy] = x³+y³

(x+y) [65 - xy] = x³+y³