Class X

 Coefficient of x2 in 4x3 + 3x2 - x + 1 is:
  1. 1
  2. 4
  3. 3
  4. 2
Simplify a(c - b) - b(a - c)
  1. ac - 2ab - bc
  2. ac - 2ab + bc
  3. ac + 2ab + bc
  4. ac + bc
Simplify 15ax2 ⁄ 5x
  1. 3ax²
  2. 3ax
  3. 5ax²
  4. 5ax
Factorise -20x2 - 9x + 20
  1. (5 + 4x)(4 - 5x)
  2. (5 - 4x)(4 - 5x)
  3. (5 - 4x)(4 + 5x)
  4. (5 + 4x)(4 + 5x)
Expand and simplfy (x - y)(x + y)
  1. x² - 2xy + y2
  2. x² + 2xy + y2
  3. x² - y²
  4. x² + y²
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