Root of quadratic equation $4 m^{2} - 9 = 0$ is

\frac{2}{3}

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2

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\pm \frac{3}{2}

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None of these

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Solution

The correct option is B $\pm \frac{3}{2}$
Given equation is $4 m^{2} - 9 = 0$
$4 m^{2} = 9$
$m^{2} = \frac{9}{4}$
$∴ m = \pm \frac{3}{2}$

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