Question

resolva as equeaçoes do 2° grau sendo U = R​

Answer 1

x² - 7x + 6 = 0

∆ = b² - 4 a c

∆ = -7² - 4 1 6

∆ = 49 - 24

∆ = 25

- b ± √∆ / 2.1

- (-7) ± √25 / 2.1

7 ± 5 / 2

x' = 12/2 = 6

x" = 2/2 = 1

x² - 8x + 15 = 0

∆ = -8² - 4 1 15

∆ = 64 - 60

∆ = 4

- (-8) ± √4 / 2.1

8 ± 2 / 2

x' = 10/2 = 5

x" = 6/2 = 3

x² + 10x + 25 = 0

∆ = 10² - 4 1 25

∆ = 100 - 100

∆ = 0

-10 ± 0 / 2

x' e x" = -10/2 = -5