-0.2x^2+45=0

Solution for -0.2x^2+45=0 equation:

Simplifying
-0.2x2 + 45 = 0

Reorder the terms:
45 + -0.2x2 = 0

Solving
45 + -0.2x2 = 0

Solving for variable 'x'.

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

Add '-45' to each side of the equation.
45 + -45 + -0.2x2 = 0 + -45

Combine like terms: 45 + -45 = 0
0 + -0.2x2 = 0 + -45
-0.2x2 = 0 + -45

Combine like terms: 0 + -45 = -45
-0.2x2 = -45

Divide each side by '-0.2'.
x2 = 225

Simplifying
x2 = 225

Take the square root of each side:
x = {-15, 15}