Question

me ajudem!!! revisão de prova. ​

Answer 1

Resposta:

$a)\\ x^2=0\\ \\ x=\sqrt{0} \\ \\ x=0$

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b)

2x² - 12x = 0

x(2x - 12) = 0

x = 0

2x - 12 = 0

2x = 12

x = 12 ÷ 2

x = 6

S = { 0 , 6 }

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c)

$x^{2} -64=0\\ \\ x^{2} =64\\ \\ x=\pm\sqrt{64} \\ \\ x=\pm8\\ \\ S=\{-8,+8\}$

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d)

$3x^{2} -27=0\\ \\ 3x^{2} =27\\ \\ x^{2} =27\div3\\ \\ x^{2} =9\\ \\ x=\pm\sqrt{9} \\ \\ x=\pm3\\ \\ S=\{-3,+3\}$