Find the roots of equation :
$81 y^{2} - 1 = 0$

\frac{1}{9}, \frac{1}{9}

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\frac{- 1}{9}, \frac{- 1}{9}

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\frac{- 1}{9}, \frac{1}{9}

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Solution

The correct option is C $\frac{- 1}{9}, \frac{1}{9}$
$81 y^{2} - 1 = 0, (9 y + 1) (9 y - 1) = 0$
$y = \frac{1}{9} o r y = \frac{- 1}{9}$

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