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D. Elementary algebra, including multiplying out brackets, factorising quadratics with integer coefficients (to include a2-b2) and solution of simultaneous linear equations by eliminating a variable. D1: Multiplying out brackets Expand the product of two linear expressions. D2: Factorising quadratics Factorising quadratic expressions, including the difference of two squares Solve quadratic equations by factorisation. Completing the square. Using the quadratic formula D3: Solution of simultaneous linear equations Solve exactly two simultaneous linear equations in two unknowns, by elimination of an unknown, and by a graphical method.