Question

What should be added to a²-2ab+b² to get a²-ab-2b² ​

Answer 1

what should be added to a²-2ab+b² to get a²-ab-2b²

let the added no is P

• 
  `\pmb{P+(a^2-2ab+b^2)=(a^2-ab-2b^2) }`

• 
  `\pmb{P=(a^2-ab-2b^2)-(a^2-2ab+b^2) }`

• 
  `\pmb{P=a^2-ab-2b^2-a^2+2ab-b^2 }`

• 
  `\pmb{P=ab-3b^2 }`

`\therefore{\pmb{ab-3b^2 }}` should be added to a²-2ab+b² to get a²-ab-2b²