Þáttun – Æfing 4.4 – Svör

  1. (A5 – B4)(A5 + B4)
  2. 3(2x – 5b)(2x + 5b)
  3. 5(4a2 – 9b2) = 5(2a – 3b)(2a + 3b)
  4. 4(4y2 + 8y + 4) = 4(2y + 2)2
  5. 8(z2 – 2z + 1) = 8(z – 1)2
  6. 3(4x2 – 12x + 9) = 3(2x – 3)2
  7. (r + s + t)(r + s – t)
  8. (p – q – x)(p + q + x)
  9. (a – b – c)(a – b + c)