Question

resolva as equações ​

Answer 1

Explicação passo-a-passo:

a) x² - 25 = 0

   x² = 25 → x = ± $\sqrt{25}$ → x = ± 5

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b) 2x² - 98 = 0

   2x² = 98 → x² = 98 : 2 → x² = 49 → x = ± $\sqrt{49}$ → x = ± 7

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c) 24 = 6x²

   x² = 24 : 6 → x² = 4 → x = ± $\sqrt{4}$ → x = ± 2

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d) 64x² - 1 = 0

   64x² = 1 → x² = $\frac{1}{64}$ → x = ± $\sqrt{\frac{1}{64} }$ → x = ± $\frac{1}{8}$

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e) 7x² - 14 = 0

   7x² = 14 → x² = 14 : 7 → x² = 2 → x = ± $\sqrt{2}$

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f) -x² + 49 = 0

  -x² = -49 → x² = 49 → x = ± $\sqrt{49}$ → x = ± 7

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g) -25 + 100x² = 0

   100x² = 25 → x² = $\frac{25}{100}$ → x = ± $\sqrt{\frac{25}{100}}$ → x = ± $\frac{5}{10}$ → x = ± $\frac{1}{2}$

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h) x² - $\frac{81}{4}$ = 0

   x² = $\frac{81}{4}$ → x = ± $\sqrt{\frac{81}{4}}$ → x = ± $\frac{9}{2}$