Question

What should be added to a^ 2 + 2ab +b^ 2 to get 4ab + b^ 2

Answer 1

Answer:

2ab - a^2 should be added.

Step-by-step explanation:

Let, the number to be added be t.

Now,

a^2 + 2ab +b^2 + t = 4ab + b^2

t = 4ab + b^2 - a^2 - 2ab -b^2

t = 2ab - a^2