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Difference of 2 Squares
Contributed by: McDermott
(Original author: Mac Dermott)
  • 1. Factorise 4x2 - 4
A) (x + 12)(x + 12)
B) (x + 4)(x + 4)
C) (x - 2)(x + 4)
D) (2x - 2)(2x +2)
  • 2. Factorise 49x2 - 9
A) (7x - 3)(7x +3)
B) (x - 5)(x + 3)
C) (x + 9)(x + 9)
D) (x + 6)(x - 6)
  • 3. Factorise 81x2 - 16
A) (x + 5)(x - 5)
B) (x - 4)(x - 2)
C) (x - 1)(x + 1)
D) (9x +4)(9x - 4)
  • 4. Factorise 121x2 - 25
A) (x + 3)(x + 2)
B) (x + 6)(x - 2)
C) (11x +5)(11x - 5)
D) (x + 1)(x + 5)
  • 5. Factorise 900x2 - 36
A) (x - 3)(x + 5)
B) (x - 7)(x + 5)
C) (30x + 6)(30x - 6)
D) (x + 5)(x + 5)
  • 6. Factorise 625x2 - 49
A) (25x +7)(25x - 7)
B) (x + 5)(x + 5)
C) (x - 5)(x + 2)
D) (x + 9)(x - 9)
  • 7. Factorise x2 - 1
A) (x + 8)(x + 5)
B) (x + 3)(x + 5)
C) (x +1)(x - 1)
D) (x + 5)(x - 9)
  • 8. Factorise 169x2 - 64
A) (13x - 8)(13x - 8)
B) (x + y)(x - 9)
C) (x + 9)(x - 9)
D) (x + 2)(x - 9)
  • 9. Factorise 144x2 - 81
A) (12x - 9)(12x +9)
B) (x + 1)(x + 8)
C) (x - 1)(x + 5)
D) (x + y)(x + 5)
  • 10. Factorise 225x2 - 100
A) (x + 1)(x + 5)
B) (x + 9)(x - 9)
C) (15x +10)(15x - 10)
D) (x + y)(x + 5)
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