Question

x
$a)x ^{2} - 9 = 0 \\ b)x ^{2} - 4 = 0 \\ c)x ^{2} - 36 = 0 \\ d)x ^{2} + 9 = 0 \\ e)x ^{2} - 16 = 0 \\ f)x ^{2} + 4 = 0 \\ g)x ^{2} - 3 = 0 \\ h)x ^{2} + 81 = 0$
gente me ajuda com álgebra pfv​

Answer 1

Resposta:

Explicação passo-a-passo:

a) x² - 9 = 0

   x² = 9

   x = √9

  x =  ± 3

S = {3, -3}

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b) x² - 4 = 0

   x² = 4

   x =√4

   x = ±2

S = {2, -2}

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c) x² - 36 = 0

   x² = 36

   x =√36

   x = ±6

S = {6, -6}

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d) x² + 9 =

   x² = - 9

   x = √- 9  

x = √-1*√9 = 3i

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e) x² - 16 =0

   x² = 16

   x = √16

  x = ±4

S = {4,-4}

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f) x² + 4 = 0

  x² = - 4

  x = √-1*√4 = 2i

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g) x² - 3 = 0

   x² = 3

   x = √3

   x = ±1,7320

S = {1,7320, - 1,7320)

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h) x² + 81 =

   x² = - 81

   x = √-81

  x = √-1*√81 = 9i

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