# How do you find the roots, real and imaginary, of #y= x^2 + 4x - 1 # using the quadratic formula?

##### 1 Answer

Jul 29, 2016

#### Answer:

#### Explanation:

The quadratic formula states that given a quadratic equation

we have

Then, with

#=(-4+-sqrt(20))/2#

#=(-4+-2sqrt(5))/2#

#=-2+-sqrt(5)#

Thus the two roots of the given equation are