Question

$x^{2}$ - 5x + 4 = 0

qual a resposta?

Answer 1

(-b+-√b²-4ac) / 2a
-(-5+-√-5²-4x1x4) / 2x1
(5+-√25-16) / 2
(5+-√9) / 2
(5+-3) / 2

x' = (5+3) /2
x' = 8/2
x' = 4

x" = (5-3) / 2
x" = 2/2
x" = 1