exam Maths Puzzle Numerical Ability

I am in need of help

Solve by using the quadratic formula X^2=5x+8

Thank you

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exam Other Question

How many ounces of pure gold must be added to five ounces of something that is 1% gold in order that the mixture is 6% gold?
I tried using the table method. I have 5 oz and need simplify
5 sqrt 5 - sqrt 20