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2x2 - 12x + 18 = 0 (divide by 2 both sides)

x2 - 6x + 9 = 0 (the double root is 3)

(x - 3)2 = 0

x - 3 = 0 (add 3 to both sides)

x = 3

Thus, the zero of f(x) = 2x2 - 12x + 18 is 3.

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14y ago

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