Question

if x+y=-1 then what is the value of x3 +y3-3xy

Answer 1

Step-by-step explanation:

The Answer is 1

Given, x+y=1

Cube on both sides give,

(x+y)3=x3+y3+3xy(x+y)

(1)3=x3+y3+3xy ……………………because, (x+y)=1

Hence,

1=x3+y3+3xy