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How does "x^2-4x+4=49" come from "(x-2)^2=49"? Where does the "-4x" come from? How does one "algebra"?? Can a mountain be upside down? The area of a new park in the shape of a square is 10x^2+7x-12. What is the length of the side of the park? Could you use EDTA titration to analyze cations other than calcium? please exaplain?