exam Maths Puzzle Numerical Ability

Solve the quadratic equations by completing the square.

x^2-6x-3=0

This one I do not have any idea.

Thank you for your help.

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The portion of the company's fixed costs allotted to this product is $300, and the supplier's cost for a set of tile is $6 each. Let x represent the number of tile sets. If b repre This question is confusing me. Please help.

Graph the inequality and shade in the correct area of the graph

x - 3y is less than or equal to 0