Question

Solve the following quadratic equation by completing the square:
x2 + 4x – 1 = 0

Answer 1

x2 + 4x – 1 = 0
(x+2)^2-4-1=0
(x+2)^2-5=0
add both sides 5
(x+2)^2=5
square root both sides
\[x+2= \pm 5\]
solve

Answer 2

^ x + 2 = +/-sqrt(5)