Question

-x²+12x-20x=0 urgente!!

Answer 1

Resposta:

S = { - 8, 0 }

Explicação passo a passo:

-x²+12x-20x=0

- x² - 8x = 0  . ( - 1 )

x² + 8x = 0

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

$x=\frac{-(+8)+/-\sqrt{(+8)^{2}-4.1.0 } }{2.1}$

$x=\frac{-8+/-\sqrt{64-0} }{2}$

$x=\frac{-8+/-\sqrt{64} }{2}$

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

$x'=\frac{-8-8}{2}$

$x'=\frac{-16}{2}$

x' = - 8

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

$x''=\frac{0}{2}$

x'' = 0

S = { - 8, 0 }

Answer 2

Resposta: S = {2,10}

Explicação passo a passo:

x = -(12) ± √(12)² - 4 . (-1) . (-20)/2 . (-1)

x = -12 ± √144 - (80)/-2

x = -12 ± √64/-2

x1 = -12 + 8/-2

x1 = -4/-2 = 2

x2 = -12 - 8/-2

x2 = -20/-2 = 10