Question

What must be subtracted from a² + b² + 2ab to get - 4ab + 2b² ?​

Answer 1

Answer:

$-2ab+b^{2}-a^{2}$

Step-by-step explanation:

let our no be x so

$a^{2}+b^{2}-2ab-x=-4ab+2b^{2}\\x=-4ab+2ab+2b^{2}-b^{2}-a^{2}\\x=-2ab+b^{2}-a^{2}$