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Question

Which of the following are true?


  1. = - 2ab +

  2. + 2ab + =

  3. All of the above

  4. All of the above


Solution

The correct options are
A

= - 2ab +


B

+ 2ab + =


(ab)2 = a2 - 2ab + b2
(b - a) = - (a - b), So (a - b) × (b - a) = - (ab)2
b2 + 2ab + a2 = (a+b)2 = a2 + 2ab + b2

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