(d+3d)-(-d+2)d=5

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Solution for (d+3d)-(-d+2)d=5 equation:


Simplifying
(d + 3d) + -1(-1d + 2) * d = 5

Combine like terms: d + 3d = 4d
(4d) + -1(-1d + 2) * d = 5
(4d) + -1(-1d + 2) * d = 5

Reorder the terms:
(4d) + -1(2 + -1d) * d = 5

Reorder the terms for easier multiplication:
(4d) + -1d(2 + -1d) = 5
(4d) + (2 * -1d + -1d * -1d) = 5
(4d) + (-2d + 1d2) = 5

Combine like terms: (4d) + -2d = 2d
2d + 1d2 = 5

Solving
2d + 1d2 = 5

Solving for variable 'd'.

Reorder the terms:
-5 + 2d + 1d2 = 5 + -5

Combine like terms: 5 + -5 = 0
-5 + 2d + 1d2 = 0

Begin completing the square.

Move the constant term to the right:

Add '5' to each side of the equation.
-5 + 2d + 5 + d2 = 0 + 5

Reorder the terms:
-5 + 5 + 2d + d2 = 0 + 5

Combine like terms: -5 + 5 = 0
0 + 2d + d2 = 0 + 5
2d + d2 = 0 + 5

Combine like terms: 0 + 5 = 5
2d + d2 = 5

The d term is 2d.  Take half its coefficient (1).
Square it (1) and add it to both sides.

Add '1' to each side of the equation.
2d + 1 + d2 = 5 + 1

Reorder the terms:
1 + 2d + d2 = 5 + 1

Combine like terms: 5 + 1 = 6
1 + 2d + d2 = 6

Factor a perfect square on the left side:
(d + 1)(d + 1) = 6

Calculate the square root of the right side: 2.449489743

Break this problem into two subproblems by setting 
(d + 1) equal to 2.449489743 and -2.449489743.

Subproblem 1

d + 1 = 2.449489743 Simplifying d + 1 = 2.449489743 Reorder the terms: 1 + d = 2.449489743 Solving 1 + d = 2.449489743 Solving for variable 'd'. Move all terms containing d to the left, all other terms to the right. Add '-1' to each side of the equation. 1 + -1 + d = 2.449489743 + -1 Combine like terms: 1 + -1 = 0 0 + d = 2.449489743 + -1 d = 2.449489743 + -1 Combine like terms: 2.449489743 + -1 = 1.449489743 d = 1.449489743 Simplifying d = 1.449489743

Subproblem 2

d + 1 = -2.449489743 Simplifying d + 1 = -2.449489743 Reorder the terms: 1 + d = -2.449489743 Solving 1 + d = -2.449489743 Solving for variable 'd'. Move all terms containing d to the left, all other terms to the right. Add '-1' to each side of the equation. 1 + -1 + d = -2.449489743 + -1 Combine like terms: 1 + -1 = 0 0 + d = -2.449489743 + -1 d = -2.449489743 + -1 Combine like terms: -2.449489743 + -1 = -3.449489743 d = -3.449489743 Simplifying d = -3.449489743

Solution

The solution to the problem is based on the solutions from the subproblems. d = {1.449489743, -3.449489743}

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