Question

3. Calcule a soma das raízes A) X² - 5X + 6 = 0 B) 2X - 10X - 12 = 0 C) 3X² - 21X +9 = 0 D) X² - 2X - 8 = 0 E) 3X² | 10X | 3 = 0

Answer 1

A) X² - 5X + 6 = 0

x' + x" = - b/a = - (- 5)/1 = 5

B) 2X - 10X - 12 = 0

x' + x" = - b/a = - (- 10)/2 = 10/2 = 5

C) 3X² - 21X +9 = 0

x' + x" = - b/a = - (- 21)/3 = 21/3 = 7

D) X² - 2X - 8 = 0

x' + x" = - b/a = - (- 2)/1 = 2/1 = 2

E) 3X² + 10X + 3 = 0

x' + x" = - b/a = - 10/3