Question

what should be added to asquare +2ab +bsquare to obtain 4ab+bsquare?​

Answer 1

Answer:

2ab-a²

Step-by-step explanation:

let the number to be added be x

a²+2ab+b²+x = 4ab+b²

                 x = 4ab+b²-b²-2ab-a²

                    = 4ab-2ab-a²

                    = 2ab-a²