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Mathematics

a2 - 2ab + b2 + a - b is equal to :

  1. (a - b) (a + b - 1)

  2. (a - b) (a + b + 1)

  3. (a + b) (a - b - 1)

  4. (a - b) (a - b + 1)

Factorisation

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Answer

a2 - 2ab + b2 + a - b

Using the formula

[∵ (x - y)2 = x2- 2xy + y2 ]

= (a2 - 2ab + b2) + a - b

= (a - b)2 + 1(a - b)

= (a - b)((a - b) + 1)

= (a - b)(a - b + 1)

Hence, option 4 is the correct option.

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