3d+(5-d)d=4

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Solution for 3d+(5-d)d=4 equation:


Simplifying
3d + (5 + -1d) * d = 4

Reorder the terms for easier multiplication:
3d + d(5 + -1d) = 4
3d + (5 * d + -1d * d) = 4
3d + (5d + -1d2) = 4

Combine like terms: 3d + 5d = 8d
8d + -1d2 = 4

Solving
8d + -1d2 = 4

Solving for variable 'd'.

Reorder the terms:
-4 + 8d + -1d2 = 4 + -4

Combine like terms: 4 + -4 = 0
-4 + 8d + -1d2 = 0

Begin completing the square.  Divide all terms by
-1 the coefficient of the squared term: 

Divide each side by '-1'.
4 + -8d + d2 = 0

Move the constant term to the right:

Add '-4' to each side of the equation.
4 + -8d + -4 + d2 = 0 + -4

Reorder the terms:
4 + -4 + -8d + d2 = 0 + -4

Combine like terms: 4 + -4 = 0
0 + -8d + d2 = 0 + -4
-8d + d2 = 0 + -4

Combine like terms: 0 + -4 = -4
-8d + d2 = -4

The d term is -8d.  Take half its coefficient (-4).
Square it (16) and add it to both sides.

Add '16' to each side of the equation.
-8d + 16 + d2 = -4 + 16

Reorder the terms:
16 + -8d + d2 = -4 + 16

Combine like terms: -4 + 16 = 12
16 + -8d + d2 = 12

Factor a perfect square on the left side:
(d + -4)(d + -4) = 12

Calculate the square root of the right side: 3.464101615

Break this problem into two subproblems by setting 
(d + -4) equal to 3.464101615 and -3.464101615.

Subproblem 1

d + -4 = 3.464101615 Simplifying d + -4 = 3.464101615 Reorder the terms: -4 + d = 3.464101615 Solving -4 + d = 3.464101615 Solving for variable 'd'. Move all terms containing d to the left, all other terms to the right. Add '4' to each side of the equation. -4 + 4 + d = 3.464101615 + 4 Combine like terms: -4 + 4 = 0 0 + d = 3.464101615 + 4 d = 3.464101615 + 4 Combine like terms: 3.464101615 + 4 = 7.464101615 d = 7.464101615 Simplifying d = 7.464101615

Subproblem 2

d + -4 = -3.464101615 Simplifying d + -4 = -3.464101615 Reorder the terms: -4 + d = -3.464101615 Solving -4 + d = -3.464101615 Solving for variable 'd'. Move all terms containing d to the left, all other terms to the right. Add '4' to each side of the equation. -4 + 4 + d = -3.464101615 + 4 Combine like terms: -4 + 4 = 0 0 + d = -3.464101615 + 4 d = -3.464101615 + 4 Combine like terms: -3.464101615 + 4 = 0.535898385 d = 0.535898385 Simplifying d = 0.535898385

Solution

The solution to the problem is based on the solutions from the subproblems. d = {7.464101615, 0.535898385}

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