Question

Resolva a equação do 2º Grau:

×2 - 6 × + 5 = 0

( ) S={ -6 , 5}

( ) S={ 0,-6 }

( )S={ -6,5}

( )S={ 1,5}


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Answer 1

$x^{2} - 6x + 5 = 0$

$\Delta = (b)^{2} -4 . a . c\\\Delta = (-6)^{2} -4 . 1 .5\\\Delta = 36 - 20\\\Delta = 16$

$x = \frac{-(b)\pm\sqrt{\Delta}}{2.a}\\x = \frac{-(-6) \pm \sqrt{16}}{2.1}$

$x' = \frac{6+4}{2} = \frac{10}{2} = 5$

$x'' = \frac{6-4}{2} = \frac{2}{2} = 1$

Resposta:

S = {1, 5}