3d-4d(d-12)=16

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Solution for 3d-4d(d-12)=16 equation:


Simplifying
3d + -4d(d + -12) = 16

Reorder the terms:
3d + -4d(-12 + d) = 16
3d + (-12 * -4d + d * -4d) = 16
3d + (48d + -4d2) = 16

Combine like terms: 3d + 48d = 51d
51d + -4d2 = 16

Solving
51d + -4d2 = 16

Solving for variable 'd'.

Reorder the terms:
-16 + 51d + -4d2 = 16 + -16

Combine like terms: 16 + -16 = 0
-16 + 51d + -4d2 = 0

Begin completing the square.  Divide all terms by
-4 the coefficient of the squared term: 

Divide each side by '-4'.
4 + -12.75d + d2 = 0

Move the constant term to the right:

Add '-4' to each side of the equation.
4 + -12.75d + -4 + d2 = 0 + -4

Reorder the terms:
4 + -4 + -12.75d + d2 = 0 + -4

Combine like terms: 4 + -4 = 0
0 + -12.75d + d2 = 0 + -4
-12.75d + d2 = 0 + -4

Combine like terms: 0 + -4 = -4
-12.75d + d2 = -4

The d term is -12.75d.  Take half its coefficient (-6.375).
Square it (40.640625) and add it to both sides.

Add '40.640625' to each side of the equation.
-12.75d + 40.640625 + d2 = -4 + 40.640625

Reorder the terms:
40.640625 + -12.75d + d2 = -4 + 40.640625

Combine like terms: -4 + 40.640625 = 36.640625
40.640625 + -12.75d + d2 = 36.640625

Factor a perfect square on the left side:
(d + -6.375)(d + -6.375) = 36.640625

Calculate the square root of the right side: 6.053150006

Break this problem into two subproblems by setting 
(d + -6.375) equal to 6.053150006 and -6.053150006.

Subproblem 1

d + -6.375 = 6.053150006 Simplifying d + -6.375 = 6.053150006 Reorder the terms: -6.375 + d = 6.053150006 Solving -6.375 + d = 6.053150006 Solving for variable 'd'. Move all terms containing d to the left, all other terms to the right. Add '6.375' to each side of the equation. -6.375 + 6.375 + d = 6.053150006 + 6.375 Combine like terms: -6.375 + 6.375 = 0.000 0.000 + d = 6.053150006 + 6.375 d = 6.053150006 + 6.375 Combine like terms: 6.053150006 + 6.375 = 12.428150006 d = 12.428150006 Simplifying d = 12.428150006

Subproblem 2

d + -6.375 = -6.053150006 Simplifying d + -6.375 = -6.053150006 Reorder the terms: -6.375 + d = -6.053150006 Solving -6.375 + d = -6.053150006 Solving for variable 'd'. Move all terms containing d to the left, all other terms to the right. Add '6.375' to each side of the equation. -6.375 + 6.375 + d = -6.053150006 + 6.375 Combine like terms: -6.375 + 6.375 = 0.000 0.000 + d = -6.053150006 + 6.375 d = -6.053150006 + 6.375 Combine like terms: -6.053150006 + 6.375 = 0.321849994 d = 0.321849994 Simplifying d = 0.321849994

Solution

The solution to the problem is based on the solutions from the subproblems. d = {12.428150006, 0.321849994}

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