Question

See attachment.
is this right?

Answer 1

You're given a quadratic equation; every quadratic equation has a solution... except! If your teacher is considering answers in the complex plane to be "non-existent solutions."

Do you know the quadratic formula?

Answer 2

http://www.wolframalpha.com/input/?i=x%5E2+%2B+18x+-4+%3D+0

Answer 3

i say yes

Answer 4

^ Yeah, you'll get that with the quadratic formula.

Answer 5

This is what i got from the last person that helped me.
x2+18x−4=0

x2+18x=4

(x+9)2=4+81=85

x+9=±√85

x=−9±√85

Answer 6

Your answer is correct, but that's not what you put in the answer-box!
The -9 does not seem to apply to the second root. I would put something like:\[-9+\sqrt{85}, \ -9-\sqrt{85}\]