lim (x

^{2}- kx + 4) / (x - 1)

^{x->1}

We could do...

just try number until it factors nicely..

k would equal 5.. to give us

x

^{2}-5x+4 = (x-1)(x-4)

the (x-1) would cancel .. leaving just x-4.. and the limit would be 1-4 = -3...

Is there an easier way of doing this than just guessing to try to figure out which value of k would make the polynomial factor nicely so that it would cancel with the factor in the denominator? Because, some of the other problems in this section get a little too tough to just be able to spit out the answer...