When dealing with a quadratic equation, you usually assign the following name to the coefficients of the variables:
[tex] ax^2+bx+c=0 [/tex]
So, [tex] a [/tex] is the coefficient of [tex] x^2 [/tex], [tex] b [/tex] is the coefficient of [tex] x [/tex] and [tex] c [/tex] is the constant term.
In your case, the coefficient of [tex] x^2 [/tex] is -3, so [tex] a=-3 [/tex]
The coefficient of [tex] x [/tex] is -2, so [tex] b = -2 [/tex]
The constant term is 6, so [tex] c = 6 [/tex]
