Class VIII

The value of (a + b)² - (a - b)² is
  1. -4ab
  2. 4ab
  3. 2a² + 2b²
  4. 2a² - 2b²
Which of the following is the common factor of: 5xy, 3pqr and 40 xyz?
  1. 5
  2. 0
  3. xy
  4. 1
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)
If p + q = 12 and pq = 22, then the value of p² + q² is
  1. -100
  2. 100
  3. 50
  4. -50
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).
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