Question

$20-x^{2} =0$

Answer 1

Ответ:

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$20 - {x}^{2} = 0 \\ - x {}^{2} = - 20 \\ x {}^{2} = 20 \\ x = + - 2 \sqrt{5} \\ x1 = - 2 \sqrt{5} \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: x2 = 2 \sqrt{5}$

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