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Factorising Quadratics Worksheet

Vedic maths trick 35: Factorising quadratics · Set 147 · 40 sums
TalentJR

The trick (Anurupyena): x² + bx + c: two numbers that multiply to c and add up to b → (x + one)(x + other). ax² + bx + c: multiply a × c; find two numbers that multiply to that and add up to b; split the middle term with them. Group the four terms in pairs and take out the common bracket. Check by multiplying back.

NameDateTime takenScore ___ / 40
  1. 1.x² + 4x − 45 =
  2. 2.x² + 4x + 3 =
  3. 3.x² − 11x + 18 =
  4. 4.x² − 5x − 24 =
  5. 5.x² − 11x + 30 =
  6. 6.x² − x − 6 =
  7. 7.x² − 4 =
  8. 8.x² − 3x − 28 =
  9. 9.x² + x − 6 =
  10. 10.x² + 2x − 63 =
  11. 11.x² − 11x + 18 =
  12. 12.2x² + 3x + 1 =
  13. 13.2x² − 9x − 35 =
  14. 14.x² + 10x + 9 =
  15. 15.2x² − x − 6 =
  16. 16.x² − 7x − 18 =
  17. 17.3x² + 28x + 60 =
  18. 18.x² − 7x + 10 =
  19. 19.x² − 7x − 8 =
  20. 20.x² + 6x + 8 =
  21. 21.x² + 10x + 16 =
  22. 22.2x² − 3x − 5 =
  23. 23.x² − 8x − 9 =
  24. 24.x² − 10x + 24 =
  25. 25.x² + 4x − 21 =
  26. 26.3x² − 20x − 63 =
  27. 27.x² + 7x − 8 =
  28. 28.2x² − 5x − 12 =
  29. 29.x² + 13x + 42 =
  30. 30.x² − 11x + 30 =
  31. 31.x² + 15x + 54 =
  32. 32.3x² + 17x − 28 =
  33. 33.x² + 14x + 48 =
  34. 34.3x² + 23x − 8 =
  35. 35.x² − 4x − 45 =
  36. 36.3x² − 31x + 36 =
  37. 37.x² − 8x − 9 =
  38. 38.x² − 6x − 16 =
  39. 39.x² − 4x − 12 =
  40. 40.3x² + 25x − 18 =

Answer key

  1. (x − 5)(x + 9)
  2. (x + 3)(x + 1)
  3. (x − 2)(x − 9)
  4. (x + 3)(x − 8)
  5. (x − 6)(x − 5)
  6. (x − 3)(x + 2)
  7. (x − 2)(x + 2)
  8. (x − 7)(x + 4)
  9. (x + 3)(x − 2)
  10. (x − 7)(x + 9)
  11. (x − 9)(x − 2)
  12. (2x + 1)(x + 1)
  13. (2x + 5)(x − 7)
  14. (x + 9)(x + 1)
  15. (2x + 3)(x − 2)
  16. (x − 9)(x + 2)
  17. (3x + 10)(x + 6)
  18. (x − 5)(x − 2)
  19. (x + 1)(x − 8)
  20. (x + 2)(x + 4)
  21. (x + 2)(x + 8)
  22. (2x − 5)(x + 1)
  23. (x + 1)(x − 9)
  24. (x − 6)(x − 4)
  25. (x + 7)(x − 3)
  26. (3x + 7)(x − 9)
  27. (x + 8)(x − 1)
  28. (2x + 3)(x − 4)
  29. (x + 6)(x + 7)
  30. (x − 5)(x − 6)
  31. (x + 9)(x + 6)
  32. (3x − 4)(x + 7)
  33. (x + 6)(x + 8)
  34. (3x − 1)(x + 8)
  35. (x + 5)(x − 9)
  36. (3x − 4)(x − 9)
  37. (x + 1)(x − 9)
  38. (x − 8)(x + 2)
  39. (x − 6)(x + 2)
  40. (3x − 2)(x + 9)

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