Resolva as equações de 2°grau abaixo :

a) 4x² - 36 = 0
b) 3x² = 27
c) x² - 4 = 12
d) 4x² - 25 = 0
e) x² + 1 = 0
f) -2x² + 7 = 0
g) 3x² = 0
h) 4 = x²
i) x² = 0
j) x² + 1 = 1

Agradeço, desde já!
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