constant function
f(x) = a graph is a horizontal line
identity function
f(x) = x points on graph have coordinates (a, a)
quadratic function
f(x) = x2 graph is U-shaped
cubic function
f(x) = x3 graph is symmetric about the origin
square root function
f(x) = sqrt(x) graph is in first quadrant
reciprocal function
f(x) = 1/x graph has two branches
absolute value function
f(x) = │x│ graph is V-shaped
