exam Maths Puzzle Numerical Ability

Solve the following quadratic equation by completing the square. I get the first part then i get lost, please help me. x^2-6x-3=0

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exam Other Question

three times the larger of two numbers is equal to four times the smaller. The sum of the numbers is 21 (12+9). Find the numbers. A coffe merchant has coffee beans that sell for $9 per pound and $12 per pound. The two types are to be mixed to create 100lb of a mixture that will sell for $11.25 per pound. How much of ech type of bean should be used in the mixture?