## anonymous one year ago .

1. Nnesha

is it x^2-64 or +64 ?

2. Nnesha

discriminant  $\huge\rm \frac{ -b \pm {\sqrt{\color{Red}{b^2-4ac}} }}{ 2a }$ the red part is discriminant you should use that to find if it's factorable or not

3. anonymous

its the way its written, and yes, i know on the internet its - but no

4. Nnesha

i'm not asking cuz its on the internet when you have x^2 minus y^2 then you can apply difference of square method ...

5. anonymous

i gtg if you could leave all of the steps for me to look at thx

6. Nnesha

$\huge\rm x^2-y^2=(x+y)(x-y)$ ^difference of squares but in ur question it's positive 64 so you can't apply that

7. anonymous

x^2 + 64=(x+8i) (x-8i)

8. anonymous

x = -8