Answer :

AL2006
The answer to your question is: 
It is a quadratic equation in 'x', with 'n' mistakenly typed in the second term..

Although you didn't ask for the solutions to the equation, I'm already here
so I might as well go through it and find them:

3x² - 2x - 5 = 0

In terms of the generic quadratic formula:
A = 3
B = -2
C = -5

Plug those into the quadratic formula, and you discover that

x = -1
and
x = ⁵/₃
[tex]3x^2-2x-5=0[/tex]

[tex](3x-5)(x+1) = 0[/tex]

[tex]3x-5=0[/tex]

[tex]3x=5[/tex]

[tex]x= \frac{5}{3} [/tex]

[tex]x+1 =0[/tex]

[tex]x=-1[/tex]

[tex]x=-1, \frac{5}{3} [/tex]