-.2x^2+20=0

Solution for -.2x^2+20=0 equation:

Simplifying
-0.2x2 + 20 = 0

Reorder the terms:
20 + -0.2x2 = 0

Solving
20 + -0.2x2 = 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 + -0.2x2 = 0 + -20

Combine like terms: 20 + -20 = 0
0 + -0.2x2 = 0 + -20
-0.2x2 = 0 + -20

Combine like terms: 0 + -20 = -20
-0.2x2 = -20

Divide each side by '-0.2'.
x2 = 100

Simplifying
x2 = 100

Take the square root of each side:
x = {-10, 10}