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Answer:
9
Step-by-step explanation:
given
x² - 6x
To complete the square
add ( half the coefficient of the x- term )² to x² - 6x
x² + 2(- 3)x + (- 3)²
= x² - 6x + 9
= (x - 3)² ← a perfect square
The value needed to add to x² - 6x is 9