Class X

 (a - b)² =
  1. a² - 2ab + b²
  2. a² + 2ab + b²
  3. a² - b²
  4. a² + b²
Expand and simplfy (x - y)(x + y)
  1. x² - 2xy + y2
  2. x² + 2xy + y2
  3. x² - y²
  4. x² + y²
 Expand and simplfy (x - 5)(x + 4)
  1. x² + 9x - 20
  2. x² - x - 9
  3. x² - x - 1
  4. x² - x - 20
Factorise x2 + x - 72
  1. (x - ?72)(x + ?72)
  2. (x - ?72)2
  3. (x - 8)(x + 9)
  4. (x + 8)(x - 9)
Simplify a(c - b) - b(a - c)
  1. ac - 2ab - bc
  2. ac - 2ab + bc
  3. ac + 2ab + bc
  4. ac + bc
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