exam Maths Puzzle Numerical Ability

i dont understand how to complete the square on y=.5x^2-3x+19/2. i also have to graph this parabola and i dont know how

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tickets $20 for singles and $35 for couples, Sales $2280 and 128 people, how many of each sold? How do I solve this 2y^2-y=6 quadratic equation using the Quadratic Formula.