d^2-4d-4=d+6

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Solution for d^2-4d-4=d+6 equation:


Simplifying
d2 + -4d + -4 = d + 6

Reorder the terms:
-4 + -4d + d2 = d + 6

Reorder the terms:
-4 + -4d + d2 = 6 + d

Solving
-4 + -4d + d2 = 6 + d

Solving for variable 'd'.

Reorder the terms:
-4 + -6 + -4d + -1d + d2 = 6 + d + -6 + -1d

Combine like terms: -4 + -6 = -10
-10 + -4d + -1d + d2 = 6 + d + -6 + -1d

Combine like terms: -4d + -1d = -5d
-10 + -5d + d2 = 6 + d + -6 + -1d

Reorder the terms:
-10 + -5d + d2 = 6 + -6 + d + -1d

Combine like terms: 6 + -6 = 0
-10 + -5d + d2 = 0 + d + -1d
-10 + -5d + d2 = d + -1d

Combine like terms: d + -1d = 0
-10 + -5d + d2 = 0

Begin completing the square.

Move the constant term to the right:

Add '10' to each side of the equation.
-10 + -5d + 10 + d2 = 0 + 10

Reorder the terms:
-10 + 10 + -5d + d2 = 0 + 10

Combine like terms: -10 + 10 = 0
0 + -5d + d2 = 0 + 10
-5d + d2 = 0 + 10

Combine like terms: 0 + 10 = 10
-5d + d2 = 10

The d term is -5d.  Take half its coefficient (-2.5).
Square it (6.25) and add it to both sides.

Add '6.25' to each side of the equation.
-5d + 6.25 + d2 = 10 + 6.25

Reorder the terms:
6.25 + -5d + d2 = 10 + 6.25

Combine like terms: 10 + 6.25 = 16.25
6.25 + -5d + d2 = 16.25

Factor a perfect square on the left side:
(d + -2.5)(d + -2.5) = 16.25

Calculate the square root of the right side: 4.031128874

Break this problem into two subproblems by setting 
(d + -2.5) equal to 4.031128874 and -4.031128874.

Subproblem 1

d + -2.5 = 4.031128874 Simplifying d + -2.5 = 4.031128874 Reorder the terms: -2.5 + d = 4.031128874 Solving -2.5 + d = 4.031128874 Solving for variable 'd'. Move all terms containing d to the left, all other terms to the right. Add '2.5' to each side of the equation. -2.5 + 2.5 + d = 4.031128874 + 2.5 Combine like terms: -2.5 + 2.5 = 0.0 0.0 + d = 4.031128874 + 2.5 d = 4.031128874 + 2.5 Combine like terms: 4.031128874 + 2.5 = 6.531128874 d = 6.531128874 Simplifying d = 6.531128874

Subproblem 2

d + -2.5 = -4.031128874 Simplifying d + -2.5 = -4.031128874 Reorder the terms: -2.5 + d = -4.031128874 Solving -2.5 + d = -4.031128874 Solving for variable 'd'. Move all terms containing d to the left, all other terms to the right. Add '2.5' to each side of the equation. -2.5 + 2.5 + d = -4.031128874 + 2.5 Combine like terms: -2.5 + 2.5 = 0.0 0.0 + d = -4.031128874 + 2.5 d = -4.031128874 + 2.5 Combine like terms: -4.031128874 + 2.5 = -1.531128874 d = -1.531128874 Simplifying d = -1.531128874

Solution

The solution to the problem is based on the solutions from the subproblems. d = {6.531128874, -1.531128874}

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