Quadratic Factorising If you can long multiply you can factorise!

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Presentation transcript:

Quadratic Factorising If you can long multiply you can factorise!

24 x (20 + 4)(20 + 8) x x x + 1

a4 a 8 a2a2 4a 8a32 a 2 4a 8a 32 a a (a + 4) (a + 8) 8a + 32 x 8(a + 4) a(a + 4) a 2 + 4a 8a a 2 + 4a a a + 32 (a + 4)(a + 8) 2 (a + 4) x (a + 8)

a-4-4 a 8 a2a2 -4a 8a-32 a 2 -4a 8a -32 a 2 + 4a (a - 4) (a + 8) 8a - 32 x 8(a - 4) a(a - 4) a 2 - 4a 8a a 2 - 4a a 2 + 4a - 32 (a - 4)(a + 8) 3 (a - 4) x (a + 8)

a-4-4 a -8-8 a2a2 -4a -8a+32 a 2 -4a -8a +32 a 2 -12a (a - 4) (a - 8) 8a + 32 x 8(a - 4) a(a - 4) a 2 - 4a -8a a 2 - 4a a a + 32 (a - 4)(a - 8) 4 (a - 4) x (a - 8)