d^2-3d+12=0

Solution for d^2-3d+12=0 equation:

Simplifying
d2 + -3d + 12 = 0

Reorder the terms:
12 + -3d + d2 = 0

Solving
12 + -3d + d2 = 0

Solving for variable 'd'.

Begin completing the square.

Move the constant term to the right:

Add '-12' to each side of the equation.
12 + -3d + -12 + d2 = 0 + -12

Reorder the terms:
12 + -12 + -3d + d2 = 0 + -12

Combine like terms: 12 + -12 = 0
0 + -3d + d2 = 0 + -12
-3d + d2 = 0 + -12

Combine like terms: 0 + -12 = -12
-3d + d2 = -12

The d term is -3d.  Take half its coefficient (-1.5).
Square it (2.25) and add it to both sides.

Add '2.25' to each side of the equation.
-3d + 2.25 + d2 = -12 + 2.25

Reorder the terms:
2.25 + -3d + d2 = -12 + 2.25

Combine like terms: -12 + 2.25 = -9.75
2.25 + -3d + d2 = -9.75

Factor a perfect square on the left side:
(d + -1.5)(d + -1.5) = -9.75

Can't calculate square root of the right side.

The solution to this equation could not be determined.