3d^2+5d-25=0

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Solution for 3d^2+5d-25=0 equation: 


Simplifying
3d2 + 5d + -25 = 0

Reorder the terms:
-25 + 5d + 3d2 = 0

Solving
-25 + 5d + 3d2 = 0

Solving for variable 'd'.

Begin completing the square.  Divide all terms by
3 the coefficient of the squared term: 

Divide each side by '3'.
-8.333333333 + 1.666666667d + d2 = 0

Move the constant term to the right:

Add '8.333333333' to each side of the equation.
-8.333333333 + 1.666666667d + 8.333333333 + d2 = 0 + 8.333333333

Reorder the terms:
-8.333333333 + 8.333333333 + 1.666666667d + d2 = 0 + 8.333333333

Combine like terms: -8.333333333 + 8.333333333 = 0.000000000
0.000000000 + 1.666666667d + d2 = 0 + 8.333333333
1.666666667d + d2 = 0 + 8.333333333

Combine like terms: 0 + 8.333333333 = 8.333333333
1.666666667d + d2 = 8.333333333

The d term is 1.666666667d.  Take half its coefficient (0.8333333335).
Square it (0.6944444447) and add it to both sides.

Add '0.6944444447' to each side of the equation.
1.666666667d + 0.6944444447 + d2 = 8.333333333 + 0.6944444447

Reorder the terms:
0.6944444447 + 1.666666667d + d2 = 8.333333333 + 0.6944444447

Combine like terms: 8.333333333 + 0.6944444447 = 9.0277777777
0.6944444447 + 1.666666667d + d2 = 9.0277777777

Factor a perfect square on the left side:
(d + 0.8333333335)(d + 0.8333333335) = 9.0277777777

Calculate the square root of the right side: 3.004626063

Break this problem into two subproblems by setting 
(d + 0.8333333335) equal to 3.004626063 and -3.004626063.


Subproblem 1
d + 0.8333333335 = 3.004626063

Simplifying
d + 0.8333333335 = 3.004626063

Reorder the terms:
0.8333333335 + d = 3.004626063

Solving
0.8333333335 + d = 3.004626063

Solving for variable 'd'.

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

Add '-0.8333333335' to each side of the equation.
0.8333333335 + -0.8333333335 + d = 3.004626063 + -0.8333333335

Combine like terms: 0.8333333335 + -0.8333333335 = 0.0000000000
0.0000000000 + d = 3.004626063 + -0.8333333335
d = 3.004626063 + -0.8333333335

Combine like terms: 3.004626063 + -0.8333333335 = 2.1712927295
d = 2.1712927295

Simplifying
d = 2.1712927295


Subproblem 2
d + 0.8333333335 = -3.004626063

Simplifying
d + 0.8333333335 = -3.004626063

Reorder the terms:
0.8333333335 + d = -3.004626063

Solving
0.8333333335 + d = -3.004626063

Solving for variable 'd'.

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

Add '-0.8333333335' to each side of the equation.
0.8333333335 + -0.8333333335 + d = -3.004626063 + -0.8333333335

Combine like terms: 0.8333333335 + -0.8333333335 = 0.0000000000
0.0000000000 + d = -3.004626063 + -0.8333333335
d = -3.004626063 + -0.8333333335

Combine like terms: -3.004626063 + -0.8333333335 = -3.8379593965
d = -3.8379593965

Simplifying
d = -3.8379593965


Solution
The solution to the problem is based on the solutions
from the subproblems.
d = {2.1712927295, -3.8379593965}

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