Completing the square is a variation, I suppose, of factoring. The idea is to make the number, which isn't factorable (is that a word?) into one that can be factored. For example,
X^2 + 4x + 4 can be factored into (x+2)^2. So if we had an equation, such as
X^2 + 4x + 3, we rearrange the equation to
X^2 + 4x + ..... = -3
Then we add 4 to both sides, like this,
X^2 + 4x + 4 = -3 + 4
Now the left side is a perfect square
(X + 2)^2 = +1
and we solve for X.
I hope this answers your question.
I am solving sytems of equations algrbraically. I have tried several times and I am not comming up with he answers for the following three equations that the book gives. 1) 4x-2y=-5 -x+2y=2 Answer in book: -1,1/2 2) -5x+2y=10
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