Question

What should be added to a² + ab-b² to obtain
120² + 3ab2​

Answer 1

Step-by-step explanation:

Let x be the polynomial that needs to be added.

so (a

2

+b

2

)+x=(a−b)

2

⇒(a

2

+b

2

)+x=a

2

+b

2

−2ab

⇒x=−2ab.

solution