Question 108992


{{{6z^2 = 60z - 126}}}.......divide both sides by {{{6}}}

{{{z^2 = 10z - 21}}}.....move all terms to the left

{{{z^2 - 10z + 21 = 0}}}

now factor it like this:

*[invoke change_this_name4450 1, -10, 21, "x"]