# How do you find the roots, real and imaginary, of #y= x^2 + 8x -9- (-x-1)^2 # using the quadratic formula?

##### 1 Answer

Jan 10, 2016

x=5/3

#### Explanation:

There are no imaginary roots of this equation.

To get the roots, put y=0

Now expand

Additionally you can also see that this equation is actually equation of a straight line so it can have at most 1 zero (which is real).