Grouping into compound factors

Grouping into compound factors

Secondary 2
TGM Original Questions

Factorise each of the following expressions completely.

  1. \(r^2+16s^2-8rs-5r+20s\)
  2. \(x^2-9y^2+3x+9y\)
  3. \(16x^2-y^2+6y-9\)
  4. \(25-4z^2-u^2+4zu\)

Solution:

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Answer:(a) \((r-4s)(r-4s-5)\); (b) \((x+3y)(x-3y+3)\); (c) \((4x-y+3)(4x+y-3)\); (d) \((5-2z+u)(5+2z-u)\).

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