4=0.25d^2

Solution for 4=0.25d^2 equation:

Simplifying
4 = 0.25d2

Solving
4 = 0.25d2

Solving for variable 'd'.

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

Add '-0.25d2' to each side of the equation.
4 + -0.25d2 = 0.25d2 + -0.25d2

Combine like terms: 0.25d2 + -0.25d2 = 0.00
4 + -0.25d2 = 0.00

Add '-4' to each side of the equation.
4 + -4 + -0.25d2 = 0.00 + -4

Combine like terms: 4 + -4 = 0
0 + -0.25d2 = 0.00 + -4
-0.25d2 = 0.00 + -4

Combine like terms: 0.00 + -4 = -4
-0.25d2 = -4

Divide each side by '-0.25'.
d2 = 16

Simplifying
d2 = 16

Take the square root of each side:
d = {-4, 4}