0.2-0.4x^2=-2

Solution for 0.2-0.4x^2=-2 equation:

Simplifying
0.2 + -0.4x2 = -2

Solving
0.2 + -0.4x2 = -2

Solving for variable 'x'.

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

Add '-0.2' to each side of the equation.
0.2 + -0.2 + -0.4x2 = -2 + -0.2

Combine like terms: 0.2 + -0.2 = 0.0
0.0 + -0.4x2 = -2 + -0.2
-0.4x2 = -2 + -0.2

Combine like terms: -2 + -0.2 = -2.2
-0.4x2 = -2.2

Divide each side by '-0.4'.
x2 = 5.5

Simplifying
x2 = 5.5

Take the square root of each side:
x = {-2.34520788, 2.34520788}