-1*x^2+8=5

Solution for -1*x^2+8=5 equation:

Simplifying
-1x2 + 8 = 5

Reorder the terms:
8 + -1x2 = 5

Solving
8 + -1x2 = 5

Solving for variable 'x'.

Move all terms containing x to the left, all other terms to the right.

Add '-8' to each side of the equation.
8 + -8 + -1x2 = 5 + -8

Combine like terms: 8 + -8 = 0
0 + -1x2 = 5 + -8
-1x2 = 5 + -8

Combine like terms: 5 + -8 = -3
-1x2 = -3

Divide each side by '-1'.
x2 = 3

Simplifying
x2 = 3

Take the square root of each side:
x = {-1.732050808, 1.732050808}