Question

x+y+1=0 then prove that X cube + y cube + 1 =3xy

Answer 1

HERE IS YOURS SOLUTION;

◆ If x+y+1 = 0

◆ prove that x3 + y3 + 1 =3xy

HERE WE SOLVE IT;

We know x+y+1=0

then x+y = -1

x+y+1 = 0

(x+y)3 = (-1)3

x3 + y3 +3xy(x+y) = -1

x3 +y3 +3xy(-1) = -1

x3 +y3 - 3xy = -1

x3 + y3 +1 = 3xy 



HENCE PROVED



HOPE IT HELPS