Answer:
y = (x - 2)² - 5
Step-by-step explanation:
y = x² - 4x - 1
using the method of completing the square
add/subtract ( half the coefficient of the x- term)² to x² - 4x
y = x² + 2(- 2)x + 4 - 4 - 1
y = (x - 2)² - 5 ← in vertex form
