Factorising and expanding 0.0 / 5 ? MathematicsAlgebraGCSEAQA Created by: ElcaCreated on: 10-06-15 17:01 Factorise and expand Factorise: Put into brackets 2x + 10 = 2(x + 5) 12x - 20 = 4(3x - 5) x^2 + 3x = x(x + 3) 6x^2 + 15x = 3x(2x + 5) Expand: Multiply everything inside by whats outside 3(x - 4) = 3x - 12 5(3x +2) = 15x + 10 x(x - 6) = x^2 - 6x 4x(3x - 5) = 12x^2 - 20x 1 of 2 Expanding quadratics (2x - 5) (x + 4) Use the square method = 2x^2 + 3x - 20 Expand and simplify (x + 3) (x + 5) = x^2 + 8x + 15 (x - 3) (x + 5) = x^2 + 2x - 15 (x + 3) (x - 5) = x^2 - 2x - 15 (x - 3) (x - 5) = x^2 - 8x + 15 2 of 2

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