Margföldun – Æfing 3.5

  1. 7(x – 1)2
  2. (7x – 7)2
  3. (x + 5)(x – 5)
  4. (2r + 4)(2r – 4)
  5. (3a + 7)(3a – 7)
  6. pb(a + b)(c + b)
  7. (x + 3)(x + 1)(x – 2)
  8. (v2 + 1)(v -1)(v + 1)