4=0.02x^2

Solution for 4=0.02x^2 equation:

Simplifying
4 = 0.02x2

Solving
4 = 0.02x2

Solving for variable 'x'.

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

Add '-0.02x2' to each side of the equation.
4 + -0.02x2 = 0.02x2 + -0.02x2

Combine like terms: 0.02x2 + -0.02x2 = 0.00
4 + -0.02x2 = 0.00

Add '-4' to each side of the equation.
4 + -4 + -0.02x2 = 0.00 + -4

Combine like terms: 4 + -4 = 0
0 + -0.02x2 = 0.00 + -4
-0.02x2 = 0.00 + -4

Combine like terms: 0.00 + -4 = -4
-0.02x2 = -4

Divide each side by '-0.02'.
x2 = 200

Simplifying
x2 = 200

Take the square root of each side:
x = {-14.142135624, 14.142135624}