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01-10-2020
Mathematics

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05-10-2020

Answer:

-3

Step-by-step explanation:

When the leading coefficient is 1, as it is here, the value that goes in the blank is half the x-coefficient. -6/2 = -3.

-3 goes in the blank.

__

The value of 'c' will be the square of this: (-3)² = 9.

x² -6x +9 = (x -3)²

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