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f(x) = x² - 9x + 18

General Formulas and Concepts:

Algebra I

Standard Form: ax² + bx + c = 0Binomial Roots: (x + a)(x + b)(x + c)(x + ...)Expanding by FOIL-ing (First, Outside, Inside, Last)

Step-by-step explanation:

Step 1: Define

Zeros/Roots x = 3, 6

Step 2: Find Function

Rewrite Binomial Roots:                    f(x) = (x - 3)(x - 6)Expand by FOIL-ing:                          f(x) = x² - 6x - 3x + 18Combine like terms (x):                      f(x) = x² - 9x + 18