Class VIII

Which of the following is quotient obtained on dividing (x2 – b) (x – a) by –(x – a)?
  1. (x2 – b)
  2. -(x2-b)/(x-a)
  3. –(x2 – b)
  4. – (x + a)
Which of the following is equal to x3 – 225x
  1. x(1 – 15x) (1 + 15x)
  2. x(x – 15) (x + 15)
  3. x(1 – 15x) (1 – 15x)
  4. x(1 + 15x) (1 – 15x).
(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 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)]
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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