Factoring Quadratic equations
I remember doing something like this in Algebra 2, but I am in PreCal so sorry if it is the wrong section..
The equation is:
When I plug this equation into the quadratic formula I get the same answers my teacher got: x=-1/2 & x=-4
This is how she factored it:
2x+1=0 | x+4=0
2x=-1 | x=-4
The problem I have w/ understanding this equation is the numbers inside the parentheses. We were taught to find factors of 4 that add up to 9 and 4+1 clearly doesn't equal 9. Can someone please explain to me how she got those numbers?
/first post. This looks like a cool site and I will be coming here for math help from now on. Hopefully I will be able to answer just as many questions as I propose :p