Respuesta :
Answer: − 2 ± √ 13
Step-by-step explanation:
(-b±√(b²-4ac))/(2a)
Plug in and solve.
Answer:
y = (x + 2)² - 13
Step-by-step explanation:
y = x² + 4x - 9
To complete the square
add/ subtract ( half the coefficient of the x- term)² to x² + 4x
y = x² + 2(2)x + 4 - 4 - 9
= (x + 2)² - 13 ← in vertex form
