The two solutions of 2x squared + 1 = 5x are j and k. What is the value of (j-1) (1-k)

We have two pairs of answers:

1st pair : j = (5+sqrt (17)) / 4 & k = (5-sqrt (17)) / 4

2nd pair : j = (5-sqrt (17)) / 4 & k = (5+sqrt (17)) / 4

If you look carefully, both of the answers are merely the same, they inly switched between the - and +.

For the first and second pairs, you will get only one answer for (j-1) (1-k), which is 1