The Geometrical Means between the roots of the equation $x^{2} - 18 x + 9 = 0$ will be

9 \sqrt{2}

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9

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3

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3 \sqrt{2}

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Solution

The correct option is C $3$
Let $α, β$ are the roots of the given quadratic equation,
$∴ α β = 9$
Thus geometric mean of roots is $= \sqrt{α β} = 3$

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