d(d-2)=46

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Solution for d(d-2)=46 equation:


Simplifying
d(d + -2) = 46

Reorder the terms:
d(-2 + d) = 46
(-2 * d + d * d) = 46
(-2d + d2) = 46

Solving
-2d + d2 = 46

Solving for variable 'd'.

Reorder the terms:
-46 + -2d + d2 = 46 + -46

Combine like terms: 46 + -46 = 0
-46 + -2d + d2 = 0

Begin completing the square.

Move the constant term to the right:

Add '46' to each side of the equation.
-46 + -2d + 46 + d2 = 0 + 46

Reorder the terms:
-46 + 46 + -2d + d2 = 0 + 46

Combine like terms: -46 + 46 = 0
0 + -2d + d2 = 0 + 46
-2d + d2 = 0 + 46

Combine like terms: 0 + 46 = 46
-2d + d2 = 46

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 = 46 + 1

Reorder the terms:
1 + -2d + d2 = 46 + 1

Combine like terms: 46 + 1 = 47
1 + -2d + d2 = 47

Factor a perfect square on the left side:
(d + -1)(d + -1) = 47

Calculate the square root of the right side: 6.8556546

Break this problem into two subproblems by setting 
(d + -1) equal to 6.8556546 and -6.8556546.

Subproblem 1

d + -1 = 6.8556546 Simplifying d + -1 = 6.8556546 Reorder the terms: -1 + d = 6.8556546 Solving -1 + d = 6.8556546 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 = 6.8556546 + 1 Combine like terms: -1 + 1 = 0 0 + d = 6.8556546 + 1 d = 6.8556546 + 1 Combine like terms: 6.8556546 + 1 = 7.8556546 d = 7.8556546 Simplifying d = 7.8556546

Subproblem 2

d + -1 = -6.8556546 Simplifying d + -1 = -6.8556546 Reorder the terms: -1 + d = -6.8556546 Solving -1 + d = -6.8556546 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 = -6.8556546 + 1 Combine like terms: -1 + 1 = 0 0 + d = -6.8556546 + 1 d = -6.8556546 + 1 Combine like terms: -6.8556546 + 1 = -5.8556546 d = -5.8556546 Simplifying d = -5.8556546

Solution

The solution to the problem is based on the solutions from the subproblems. d = {7.8556546, -5.8556546}

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