exam Maths Puzzle Numerical Ability

How do I solve this 2y^2-y=6 quadratic equation using the Quadratic Formula.

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exam Other Question

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 P=10-.2Q
P=2+.2Q
Please solve for Q. Q has the same value in each equation.

Thanks