x^2-28+8=0

Solution for x^2-28+8=0 equation:

Simplifying
x2 + -28 + 8 = 0

Reorder the terms:
-28 + 8 + x2 = 0

Combine like terms: -28 + 8 = -20
-20 + x2 = 0

Solving
-20 + x2 = 0

Solving for variable 'x'.

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

Add '20' to each side of the equation.
-20 + 20 + x2 = 0 + 20

Combine like terms: -20 + 20 = 0
0 + x2 = 0 + 20
x2 = 0 + 20

Combine like terms: 0 + 20 = 20
x2 = 20

Simplifying
x2 = 20

Take the square root of each side:
x = {-4.472135955, 4.472135955}