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
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
The value of (a + b)² + (a - b)² is
  1. -4ab
  2. 4ab
  3. 2a² + 2b²
  4. 2a² - 2b²
The value of (7x2 + 14x)/(x + 2) is
  1. 2x
  2. 5x
  3. 7x
  4. 9x
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)
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