Þáttun – Æfing 4.1 – Lausnir

  1. 5a – 15 = 5(a – 3)
  2. 9x – 3y = 3(3x – y)
  3. 3bq – 12cq = 3q(b – 4c)
  4. 6b – 9p2 = 3(2b – 3q)
  5. arb + arc + adr = ar(b + c + d)
  6. 8pq – 4pr + 4p2 = 4p(2q – r + p)
  7. 8x3v + 12x2v2 + 16xv3 = 4xv(x2 + 3xv + 16v2)
  8. xa + bx + ay + yb = x(a + b) + y(a + b) = (x + y)(a + b)
  9. ax +2av – bx – 2bv = x(a – b) + 2v(a – b) = (x + 2v)(a – b)