Square Root Functions
You can identify a square root function by the equation
They are half parabolas on their sides.
Absolute Value functions
You can identify an absolute value function by the equation
y = |x|
These look like the letter "V".
The graph of the function
f(x) = |x - 2| + 1
Notice that the vertex is at the point (2,1) since the graph is shifted right 2 and up 1.