Verified Answer :

Panoyin

The constant that is to form a perfect square trinomial is 9.

x² - 6x + 9
x² - 3x - 3x + 9
x(x) - x(3) - 3(x) + 3(3)
x(x - 3) - 3(x - 3)
(x - 3)(x - 3)
(x - 3)²

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