Verified Answer :

hartnn

If the brackets need to be a square term of the form (x+h)^2
then
just half the co-efficient of x term and square it.

So here it will be
(-6)/2 = -3
squaring it, (-3)^2 = 9

so 9 is what goes in the blank to make the bracket () of the form (x+h)^2

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