Class VIII

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).
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).
Common factor of 17abc, 34ab2 and 51a2 b is
  1. 17abc
  2. 17 ab
  3. 17ac
  4. 17 a² b² c
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).
The value of (a + b)² + (a - b)² is
  1. -4ab
  2. 4ab
  3. 2a² + 2b²
  4. 2a² - 2b²
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