I was reading the solution of a problem and I can't figure out how to go from here:
$k^4 + 2k^3 -k^2 - 2k + 1$
to:
$((k^2 + k) -1)^2$
I guess it's using the complete-the-square method but I've only used that with quadratic expressions.
I was reading the solution of a problem and I can't figure out how to go from here:
$k^4 + 2k^3 -k^2 - 2k + 1$
to:
$((k^2 + k) -1)^2$
I guess it's using the complete-the-square method but I've only used that with quadratic expressions.