Factorising Quadratics Worksheet
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.x² − 4x − 5 =
- 2.x² − 8x + 7 =
- 3.3x² + 13x + 12 =
- 4.2x² − 9x − 56 =
- 5.x² − 6x + 8 =
- 6.x² − 6x + 5 =
- 7.2x² + 13x + 15 =
- 8.x² − 9 =
- 9.2x² − 11x − 40 =
- 10.x² − 4x − 5 =
- 11.x² − 2x − 3 =
- 12.2x² + 3x − 14 =
- 13.x² + 4x + 3 =
- 14.x² + 6x − 16 =
- 15.x² − 4x + 3 =
- 16.2x² − 3x − 5 =
- 17.x² − x − 2 =
- 18.2x² + 17x + 30 =
- 19.x² − 15x + 56 =
- 20.x² − 1 =
- 21.x² − 25 =
- 22.x² − 25 =
- 23.x² + 2x − 35 =
- 24.x² − 15x + 56 =
- 25.x² − x − 42 =
- 26.2x² − 7x − 49 =
- 27.2x² − 15x + 7 =
- 28.x² − 25 =
- 29.x² − x − 42 =
- 30.x² + 3x − 4 =
- 31.x² + 3x − 10 =
- 32.3x² + 17x − 56 =
- 33.2x² + 11x + 12 =
- 34.x² + 10x + 16 =
- 35.x² + 7x + 6 =
- 36.2x² − x − 6 =
- 37.2x² + x − 21 =
- 38.3x² − 34x + 80 =
- 39.2x² − 13x − 24 =
- 40.x² + 3x − 4 =
Answer key
- (x + 1)(x − 5)
- (x − 1)(x − 7)
- (3x + 4)(x + 3)
- (2x + 7)(x − 8)
- (x − 2)(x − 4)
- (x − 5)(x − 1)
- (2x + 3)(x + 5)
- (x − 3)(x + 3)
- (2x + 5)(x − 8)
- (x − 5)(x + 1)
- (x − 3)(x + 1)
- (2x + 7)(x − 2)
- (x + 3)(x + 1)
- (x − 2)(x + 8)
- (x − 3)(x − 1)
- (2x − 5)(x + 1)
- (x − 2)(x + 1)
- (2x + 5)(x + 6)
- (x − 7)(x − 8)
- (x − 1)(x + 1)
- (x − 5)(x + 5)
- (x − 5)(x + 5)
- (x + 7)(x − 5)
- (x − 8)(x − 7)
- (x − 7)(x + 6)
- (2x + 7)(x − 7)
- (2x − 1)(x − 7)
- (x − 5)(x + 5)
- (x + 6)(x − 7)
- (x + 4)(x − 1)
- (x − 2)(x + 5)
- (3x − 7)(x + 8)
- (2x + 3)(x + 4)
- (x + 2)(x + 8)
- (x + 1)(x + 6)
- (2x + 3)(x − 2)
- (2x + 7)(x − 3)
- (3x − 10)(x − 8)
- (2x + 3)(x − 8)
- (x − 1)(x + 4)
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