Question

what should be added to p3 + 3p2q+3pq2+q3 to get p3+q3

Answer 1

-3pq2-3p2q.......... Should be added

Answer 2

let the no. be x
x + p3 + 3p2q + 3pq2 + q3 = p3 + q3
x = p3 + q3 - ( p3 + 3p2q + 3pq2 + q3 )
x = p3 + q3 - p3 - 3p2q - 3pq2 - q3
x = -3p2q - 3pq2