Þáttun – Æfing 4.3 – Lausnir

  1. p2 – q2 = (p – q)(p + q) (samokareglan notuð)
  2. B2 – 9x2 = (B – 3x)(B + 3x) (samokareglan notuð)
  3. 16r2 – 1 = (4r – 1)(4r + 1) (samokareglan notuð)
  4. 36 – y2 = (6 – y)(6 + y) (samokareglan notuð)
  5. 25x2 – 4b2 = (5x – 2b)(5x + 2b) (samokareglan notuð)
  6. 9z2 – 25s2 = (3z – 5s)(3z + 5s) (samokareglan notuð)
  7. X4 – 9y2 = (x2 – 3y)(x2 + 3y) (samokareglan notuð)
  8. X6 – 1 = (x3 – 1)(x3 + 1) (samokareglan notuð)