Question

what should be added to a square -b square to obtain 4ab+b square​

Answer 1

Answer: hey mate

I hope the question is What should be added to a^2+ 2ab + b^2 to obtain 4ab + b square ? ​

There is no need to add anything in b 2 as it will remain as it is in the obtained answer. We will add 2ab to 2ab as they are like terms and the numerical value of like terms get added or subtracted according to the opretion and so will happen with these two also. 4ab+b2-a2-2ab-b2.