Question 1207661
i did the following:


let k = x^-1


x^-2 = x^-1 * x^-1 = k * k = k^2


2x^(-2) - 3x^(-1) - 4 = 0 becomes:


2k^2 - 3k - 4 = 0


factor by using quadratic formula to get:


k = -.8507810594 or 2.350781059.


since k = x^-1, then:


x^-1 = -.8507810594 or 2.350781059.


this means that 1/k = -.8507810594 or 2.350781059.


solve for k to get:


k = 1/.8507810594 or 1/2.350781059.


k becomes 1.17539053 or .4253905297.


round as necessary.