exam Maths Puzzle Numerical Ability

How do I complete the square for m(x)=-x^2+6x-4?

I tried dividing 6x by 2 and factored out -1 from x^2+6x. But how do you get the other number?

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exam Other Question

Find y as a function of x. The constant Cis a positive number.
ln(y-3)=ln 2(x^2)+ln C
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