What is the vertex form of a parabola function y = ax^2 and how does "a" affect the opening direction and width of the parabola?
+
What is the domain of the reciprocal function f(x) = 1/x? Explain how the graph of f(x) changes when x approaches positive or negative infinity and when x approaches zero.
+
What is the basis of vectors in the subspace spanned by (1,0,1) and (0,1,1)?