Resolver :
A) 9x^2 - 4x = 0
B) x^2 - raiz quadrada de 3x = 0
C) 7x^2 + 2 = 0
D) 3(x^2 - 1) = 24
A) 9x^2 - 4x = 0
B) x^2 - raiz quadrada de 3x = 0
C) 7x^2 + 2 = 0
D) 3(x^2 - 1) = 24
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Verified answer
A)9x² - 4x = 0
x.(9x-4) = 0
x' = 0
9x-4 = 0
9x = 4
x = 4/9 S = { 0 , 4/9 }
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b)
x² - √3x = 0
x.(x-√3) = 0
x' = 0
x-√3 = 0
x'' = √3 S = { 0 , √3 }
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C)
7x² + 2 = 0
7x² = - 2
x² = -2/7
x = √-2/7 Não possui solução em R
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D)
3.(x² - 1) = 24
3x² - 3 = 24
3x² = 24 + 3
3x² = 27
x² = 27/3
x² = 9
x = √9
x' = 3
x'' = -3 S = { -3 , 3 } ok