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Why does the (h,k) in 2x^2 + 4x end up being (-1,-2) when the vertex form ends up being 2 (x+1)^2 -2? Why isn't it (1, -2)? Is there an over the counter pill that looks like generic percocet? Find a. the number of lines of symmetry of the diagram, b. the order of rotational symmetry of the diagram.? Whats the van't hoff factor of cacl2? Why does the graph of a square root function look like half a parabola?