3d^2-4d=60

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Solution for 3d^2-4d=60 equation:


Simplifying
3d2 + -4d = 60

Reorder the terms:
-4d + 3d2 = 60

Solving
-4d + 3d2 = 60

Solving for variable 'd'.

Reorder the terms:
-60 + -4d + 3d2 = 60 + -60

Combine like terms: 60 + -60 = 0
-60 + -4d + 3d2 = 0

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

Divide each side by '3'.
-20 + -1.333333333d + d2 = 0

Move the constant term to the right:

Add '20' to each side of the equation.
-20 + -1.333333333d + 20 + d2 = 0 + 20

Reorder the terms:
-20 + 20 + -1.333333333d + d2 = 0 + 20

Combine like terms: -20 + 20 = 0
0 + -1.333333333d + d2 = 0 + 20
-1.333333333d + d2 = 0 + 20

Combine like terms: 0 + 20 = 20
-1.333333333d + d2 = 20

The d term is -1.333333333d.  Take half its coefficient (-0.6666666665).
Square it (0.4444444442) and add it to both sides.

Add '0.4444444442' to each side of the equation.
-1.333333333d + 0.4444444442 + d2 = 20 + 0.4444444442

Reorder the terms:
0.4444444442 + -1.333333333d + d2 = 20 + 0.4444444442

Combine like terms: 20 + 0.4444444442 = 20.4444444442
0.4444444442 + -1.333333333d + d2 = 20.4444444442

Factor a perfect square on the left side:
(d + -0.6666666665)(d + -0.6666666665) = 20.4444444442

Calculate the square root of the right side: 4.521553322

Break this problem into two subproblems by setting 
(d + -0.6666666665) equal to 4.521553322 and -4.521553322.

Subproblem 1

d + -0.6666666665 = 4.521553322 Simplifying d + -0.6666666665 = 4.521553322 Reorder the terms: -0.6666666665 + d = 4.521553322 Solving -0.6666666665 + d = 4.521553322 Solving for variable 'd'. Move all terms containing d to the left, all other terms to the right. Add '0.6666666665' to each side of the equation. -0.6666666665 + 0.6666666665 + d = 4.521553322 + 0.6666666665 Combine like terms: -0.6666666665 + 0.6666666665 = 0.0000000000 0.0000000000 + d = 4.521553322 + 0.6666666665 d = 4.521553322 + 0.6666666665 Combine like terms: 4.521553322 + 0.6666666665 = 5.1882199885 d = 5.1882199885 Simplifying d = 5.1882199885

Subproblem 2

d + -0.6666666665 = -4.521553322 Simplifying d + -0.6666666665 = -4.521553322 Reorder the terms: -0.6666666665 + d = -4.521553322 Solving -0.6666666665 + d = -4.521553322 Solving for variable 'd'. Move all terms containing d to the left, all other terms to the right. Add '0.6666666665' to each side of the equation. -0.6666666665 + 0.6666666665 + d = -4.521553322 + 0.6666666665 Combine like terms: -0.6666666665 + 0.6666666665 = 0.0000000000 0.0000000000 + d = -4.521553322 + 0.6666666665 d = -4.521553322 + 0.6666666665 Combine like terms: -4.521553322 + 0.6666666665 = -3.8548866555 d = -3.8548866555 Simplifying d = -3.8548866555

Solution

The solution to the problem is based on the solutions from the subproblems. d = {5.1882199885, -3.8548866555}

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