Question

resposta completa de -x²+12×-20=0​

Answer 1

S = { 2 , 10 }

Explicação passo-a-passo:

- x² + 12x - 20 = 0 . ( - 1 )

x² - 12x + 20 = 0

$x = \frac{ - b + - \sqrt{ {b}^{2} - 4ac} }{2a}$

$x = \frac{ - ( - 12) + - \sqrt{ {( - 12)}^{2} - 4.1.20} }{2.1}$

$x = \frac{12 + - \sqrt{144 - 80} }{2}$

$x = \frac{12 + - \sqrt{64} }{2}$

$x = \frac{12 + - 8}{2}$

$x1 = \frac{12 - 8}{2}$

$x1 = \frac{4}{2}$

x' = 2

$x2 = \frac{12 + 8}{2}$

$x2 = \frac{20}{2}$

x''= 10

S = { 2 , 10 }