Class VIII

Which of the following are the factors of a2 + ab +bc + ca
  1. (b + c) (c + a)
  2. ) (a + b) (a + c)
  3. a(a + b + c)
  4. (a + b) (b + c).
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 is the factorisation of x3 – x?
  1. x(x – x2)
  2. x[(1+ x) (1 – x)]
  3. x(x2 – x)
  4. x[(x + 1) (x – 1)]
(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 is quotient obtained on dividing –18 xyz2 by –3 xz?
  1. 6 Yz
  2. –6 yz
  3. 6 xy2
  4. 6 xy
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