What are the possible values of x in 8^2+4x = - 1

So we can simplify this to

36+4x=-1

We can subtract by 64 on both sides. 4x = - 37. Therefore the answer to this is

x = - 37/4 = - 9.25.

So the answer for x is - 16.25. If you were trying to do a quadratic equation then sorry because you worded it wrong, and I solved properly.

Answer: - 9.25