0.4x^2-2=0

Solution for 0.4x^2-2=0 equation:

Simplifying
0.4x2 + -2 = 0

Reorder the terms:
-2 + 0.4x2 = 0

Solving
-2 + 0.4x2 = 0

Solving for variable 'x'.

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

Add '2' to each side of the equation.
-2 + 2 + 0.4x2 = 0 + 2

Combine like terms: -2 + 2 = 0
0 + 0.4x2 = 0 + 2
0.4x2 = 0 + 2

Combine like terms: 0 + 2 = 2
0.4x2 = 2

Divide each side by '0.4'.
x2 = 5

Simplifying
x2 = 5

Take the square root of each side:
x = {-2.236067978, 2.236067978}