Question

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Answer 1

is it x^2-64 or +64 ?

Answer 2

`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

Answer 3

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

Answer 4

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 ...

Answer 5

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

Answer 6

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

Answer 7

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

Answer 8

x = -8