Complete the square to rewrite y=x^2+4x+1 in vertex form

y = (x + 2)² - 3

Step-by-step explanation:

 y = x² + 4x + 1

-1                 -1  

y - 1 = x² + 4x

y - 1 + ____ = x² + 4x + ____

             ↑              ↓         ↑    

y - 1 +  4   = x² + 4x +  4  

   y + 3      = (x + 2)²

      -3                      -3

    y           =  (x + 2)² - 3

1. sometimes

2. never true

3. sometimes

step-by-step explanation:

these are pretty self explanatory if you know what supp right and com angles are