Class VIII

(y – x) (y + x) is equal to which of the following:
  1. y2 – yx
  2. yx – x2
  3. y2 – x2
  4. ) x2 – y2
Which of the following are the factors of a2 + ab + bc + ca
  1. ab – a – b + 1 = (1 – a)(1 – b)
  2. ab – a – b + 1 = (a – 1)(b – 1)
  3. ab – a – b + 1 = (1 – a)(b – 1)
  4. ab – a – b + 1 = (a – 1)(1 – b)
The product of 6a2 - 7b + 5ab and 2ab is
  1. 12a3 b - 14ab2 + 10ab
  2. 12a3 b - 14ab2 + 10a2 b2
  3. 6a2 - 7b + 7ab
  4. 12a2 b - 7ab2 + 10ab
Which of the following is the common factor of 21 x2y and 35 xy2?
  1. 7
  2. xy
  3. 7xy
  4. None of these
Which of the following arc the factors of 1 – x2?
  1. (x + l) (x – I)
  2. (1 – x) (1 + x)
  3. (1 – x) (1 – x)
  4. (1 + x) (1 + x).
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