Verified 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

\(3x^2-2x-5=0\)

\((3x-5)(x+1) = 0\)

\(3x-5=0\)

\(3x=5\)

\(x= \frac{5}{3}\)

\(x+1 =0\)

\(x=-1\)

\(x=-1, \frac{5}{3}\)