3=0.3x^2

Solution for 3=0.3x^2 equation:

Simplifying
3 = 0.3x2

Solving
3 = 0.3x2

Solving for variable 'x'.

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

Add '-0.3x2' to each side of the equation.
3 + -0.3x2 = 0.3x2 + -0.3x2

Combine like terms: 0.3x2 + -0.3x2 = 0.0
3 + -0.3x2 = 0.0

Add '-3' to each side of the equation.
3 + -3 + -0.3x2 = 0.0 + -3

Combine like terms: 3 + -3 = 0
0 + -0.3x2 = 0.0 + -3
-0.3x2 = 0.0 + -3

Combine like terms: 0.0 + -3 = -3
-0.3x2 = -3

Divide each side by '-0.3'.
x2 = 10

Simplifying
x2 = 10

Take the square root of each side:
x = {-3.16227766, 3.16227766}