Question 211128
Simple, you don't factor polynomials with negative exponents.  You put the negative exponents in the denominator and the get a common denominator and solve that way. You will end up having to factor but the exponents will be positive.   <br>

3x^-2 -7x^-1 -6 = 0
{{{3/x^2 - 7/x - 6 = 0}}}<br>

The common denominator on this problem is going to be x^2 so multiply the second part of the equation by x and the 6 by x^2.  This will get us:<br>

{{{(3 - 7x - 6x^2)/x^2 = 0}}}<br>

Now we multiply both sides by x^2 and that leaves us with the following polynomial:<br>

3 - 7x - 6x^2 = 0<br>

Now we solve this like any regular polynomial.<br>

3 - 7x - 6x^2 = 0
6x^2 + 7x - 3 = 0 
(2x+3)(3x-1) = 0
2x+3 = 0 and 3x-1 = 0 
x = -3/2 and x = 1/3<br>

I will leave the second equation for you to do but its solved in a similar manor.