3=0.25d^2

Solution for 3=0.25d^2 equation:

Simplifying
3 = 0.25d2

Solving
3 = 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.
3 + -0.25d2 = 0.25d2 + -0.25d2

Combine like terms: 0.25d2 + -0.25d2 = 0.00
3 + -0.25d2 = 0.00

Add '-3' to each side of the equation.
3 + -3 + -0.25d2 = 0.00 + -3

Combine like terms: 3 + -3 = 0
0 + -0.25d2 = 0.00 + -3
-0.25d2 = 0.00 + -3

Combine like terms: 0.00 + -3 = -3
-0.25d2 = -3

Divide each side by '-0.25'.
d2 = 12

Simplifying
d2 = 12

Take the square root of each side:
d = {-3.464101615, 3.464101615}