Question

Por favor usem cálculos!!!
preciso urgentemente!!​

Answer 1

Resposta:

29

x² - 3x + 6 = 0

3² -3.5 + 6 = 0

9 - 15 + 6 = 0

-6 + 6 = 0

0 = 0

r1 = 3

r2 = 5

a) r1 + r2 = 3 + 5 = 8

b) r1 . r2 = 3 . 5 = 15

c) 1/r1 + 1/r2 = 1/3 + 1/5 = 5/15 + 3/15 = 8/15

d) r1² + r2² = 3² + 5² = 9 + 25 = 36

e) (4r1 + 1) . (4r² + 1) = (4.3 + 1) . (4.5 + 1) = (12 + 1) . (20 + 1) = (12) . (21) = 252

f) (-7r1 - 7r2)² = (-7.3 - 7.5)² = (-21 - 35)² = (-56)² = 3.136