I am trying to complete the square, just for a quadratic equation, not for a graph. i had no problem with completing the square the first time around, but suddenly, i am getting all the review questions wrong and i dont know why! here is an example:
first, i cleared the co-efficient of the A term and came up with:
(i took half of 2 [which is 1] and squared it [which is 1], added to both sides)
(i rationalized and came up with):
the book says the answer is
where on earth did that -2 come from? all of the problems i have done have the wrong number in front of the plus/minus. i think it has something to do with the co-efficient of the A term, but i dont remember having to do anything with that. i know how to complete the square, i just dont know where that -2 came from. any insight?
im so sorry about the confusing squares and radicals. i have changed it, a little too late, but at least now i know how to do it! my apologies.
so, in terms of the -2 that is mystifying me, is it a -2 because the entire answer is under a 2 and if i let that -1 there, it would become -1/2? so i must change it to -2/2 (of course which is still -1) to keep the answer correct?(i hope the way im working this makes sense!) im sorry, im studying for finals and i think my head is too clogged . thank you for you time.