Using factorization find roots of quadratic equation:
$10 z^{2} - 20 = 0$

\sqrt{2}, - \sqrt{2}

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\sqrt{2}, \sqrt{2}

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- \sqrt{2}, - \sqrt{2}

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None

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Solution

The correct option is A $\sqrt{2}, - \sqrt{2}$

$10 z^{2} - 20 = 0, 10 (z^{2} - 2) = 0$
$z^{2} - {(\sqrt{2})}^{2}, z = \sqrt{2}, - \sqrt{2}$

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