exam Maths Puzzle Numerical Ability

Please help, it says to solve by completing the square.
x^2-3x+1=0
What I got for this was x-2 x+8 2-83
I am not so sure about my answer, please help! Thank You=)

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exam Other Question

6=4x-x+9 Find each value of f(x)=x^2+2x-4/x+6

1. f(4) 2. f(-8)


Please help me with this problem.