0.2x^2-4=0

Solution for 0.2x^2-4=0 equation:

Simplifying
0.2x2 + -4 = 0

Reorder the terms:
-4 + 0.2x2 = 0

Solving
-4 + 0.2x2 = 0

Solving for variable 'x'.

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

Add '4' to each side of the equation.
-4 + 4 + 0.2x2 = 0 + 4

Combine like terms: -4 + 4 = 0
0 + 0.2x2 = 0 + 4
0.2x2 = 0 + 4

Combine like terms: 0 + 4 = 4
0.2x2 = 4

Divide each side by '0.2'.
x2 = 20

Simplifying
x2 = 20

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