book Maths Puzzle Numerical Ability

I am having major problems solving by completing the square 2x^2-6x=5. I have no idea where to begin

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How do I solve this equation

4x+7y=1303560

What are the optimum values for x & y?
Explain what the value of the discriminant means to the graph of {{{ y = ax^2 + bx + c }}}. Hint: Chose values of a, b and c to create a particular discriminant. Then, graph the c