Question

if x+y=z then prove that x cube+y cube+3xyz=z cube

Answer 1

we know that( X + Y )ka whole cube equal to x cube + y cube + 3 x square Y + 3 x y square or x cube + y cube + 3 x y ( X + Y ) (sinceX + Y equal to Z ) ( then we put Z at the place of X + Y ) and the equation will be x cube + y cube + 3 x y z (hence this equation got proved ) thanks