Question

Calcule as raizes das funçoes a seguir,se existem.

Answer 1

A) x² + x = 0

x( x + 1 ) = 0

x' = 0

x + 1 = 0

x" = - 1

B) 2x² - 3x = 0

x(2x - 3 ) = 0

x' = 0

2x - 3 = 0

2x = 3

x" = 3/2

C) - x² + 10x - 25 = 0

x = - 10 + -√100 - 100
      -----------------------
                  2

x' = x" = - 10/2  →  - 5

D) x² - 6x + 8 = 0

x = 3 + -√9 - 8

x' = 3 + 1  →  x' = 4

x" = 3 - 1  →  x" = 2