(X+2)! ÷ X! = 6 Com X > 0
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(x+2)!
--------- = 6
x!
(x+2).(x+1).x!
------------------ = 6
x!
(x+2).(x+1) = 6
x² +3x +2 - 6 = 0
x² +3x -4 = 0
∆= 9 +16= 25 ==> √∆=5
x' = -b+√∆/2a = -3+5/2 = 2/2 = 1 ✓
--------- = 6
x!
(x+2).(x+1).x!
------------------ = 6
x!
(x+2).(x+1) = 6
x² +3x +2 - 6 = 0
x² +3x -4 = 0
∆= 9 +16= 25 ==> √∆=5
x' = -b+√∆/2a = -3+5/2 = 2/2 = 1 ✓
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