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In the function f(x) = 4(x2 − 6x + ____) + 20, what number belongs in the blank to complete the square?
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In the function f(x) = 4(x2 − 6x + ____) + 20, what number belongs in the blank to complete the square?

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that would be -9
x^2 - 6x = (x - 3)^2 - 9
User Wyqydsyq
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