Resolva as equações polinomiais do 2° grau disfarçadas.

a) (x² + 5)² - 20 (x² + 9) + 84

b) x² (x² - 10) + 9 = (x + 1)•(x - 1)

c) (2x² - 5) = 39 + 10 (2x² - 5)
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