Write the Quadratic Function in Vertex Form $$y = x ^ { 2 } - 20 x$$

Multiple Choice

Write the quadratic function in vertex form.
- $$y = x ^ { 2 } - 20 x$$

A) $y = ( x + 10 ) ^ { 2 } - 10$
B) $y = ( x + 20 ) ^ { 2 } - 20$
C) $y = ( x - 10 ) ^ { 2 } - 100$
D) $y = ( x - 20 ) ^ { 2 } - 400$