According to economists, this episode of great recession was resulted from a sudden busting of house bubble in US, where the house bubble was caused by rapid growth of improper regulation on sub-prime mortgages (Merriam 2009; Wang 2009; Whitney 2007).
When working with equations that have two variables, the coordinate plane is an important tool. It's a way to draw pictures of equations that makes them easier to understand. To create a coordinate plane, start with a sheet of graph or grid paper. Next, draw a horizontal line.
From here, finding the vertex is very simple: take the value in the parentheses #(-2)#, and reverse the sign, so that now you have #2#. Congratulations, you just found your #x#-value of the coordinate pair. To find the #y#-value, just take the value of the constant, and don't change any signs; just leave it alone. Now you have all you need to create a coordinate pair. #(2, -3)# is the vertex, and lest's just confirm that by graphing the original equation. graph{y=x^2-4x+1}. And the vertex is #(2,-3)#!