Ola sa

-x² + 5x - 6 ≥ 0

delta

d² = 25 - 24 = 1

d = 1

x = (-5 + 1)/-2 = 2

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

2 ≤ x ≤ 3

pronto

B²-4.a.c

X= -(B)+- raiz de delta

2.a

RESOLVA VC

http://www.wolframalpha.com/input/?i=+-x%C2%B2+%2B...