It has been a great many years since I did any algebra, now my
son hits me with this:- x squared + 2x = y find x and y x
squared + 2x = 48 find x The factors of 48 that differ by 2 are
6 and 8, so x=6 or -6 and -8 so x=-8 as that is 2 less than -6.
We are looking for the factors of -48 that add to give 2, these
are -6 and 8, since Two values multiplied give zero means x-6=0
or x+8=0, so x=6 or -8. For the first one, you need more
information, because you can take any x, square it and add 2x
and call the answer y.