What is the Correct Method for Evaluating Limits?

[DollarBill]

Homework Statement

http://img517.imageshack.us/img517/5817/96728501it3.jpg

The Attempt at a Solution

I plugged in the values 1 and -4 and got

6(-4)-1 / 3+1

equals -7.333. But got the question wrong. What am I doing wrong?

 

[dirk_mec1]

(6*-4 - 1)/4= - 6.25

 

[DollarBill]

Must of put it into my calculator wrong..Thanks