d^2-22d=31

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Solution for d^2-22d=31 equation:


Simplifying
d2 + -22d = 31

Reorder the terms:
-22d + d2 = 31

Solving
-22d + d2 = 31

Solving for variable 'd'.

Reorder the terms:
-31 + -22d + d2 = 31 + -31

Combine like terms: 31 + -31 = 0
-31 + -22d + d2 = 0

Begin completing the square.

Move the constant term to the right:

Add '31' to each side of the equation.
-31 + -22d + 31 + d2 = 0 + 31

Reorder the terms:
-31 + 31 + -22d + d2 = 0 + 31

Combine like terms: -31 + 31 = 0
0 + -22d + d2 = 0 + 31
-22d + d2 = 0 + 31

Combine like terms: 0 + 31 = 31
-22d + d2 = 31

The d term is -22d.  Take half its coefficient (-11).
Square it (121) and add it to both sides.

Add '121' to each side of the equation.
-22d + 121 + d2 = 31 + 121

Reorder the terms:
121 + -22d + d2 = 31 + 121

Combine like terms: 31 + 121 = 152
121 + -22d + d2 = 152

Factor a perfect square on the left side:
(d + -11)(d + -11) = 152

Calculate the square root of the right side: 12.328828006

Break this problem into two subproblems by setting 
(d + -11) equal to 12.328828006 and -12.328828006.

Subproblem 1

d + -11 = 12.328828006 Simplifying d + -11 = 12.328828006 Reorder the terms: -11 + d = 12.328828006 Solving -11 + d = 12.328828006 Solving for variable 'd'. Move all terms containing d to the left, all other terms to the right. Add '11' to each side of the equation. -11 + 11 + d = 12.328828006 + 11 Combine like terms: -11 + 11 = 0 0 + d = 12.328828006 + 11 d = 12.328828006 + 11 Combine like terms: 12.328828006 + 11 = 23.328828006 d = 23.328828006 Simplifying d = 23.328828006

Subproblem 2

d + -11 = -12.328828006 Simplifying d + -11 = -12.328828006 Reorder the terms: -11 + d = -12.328828006 Solving -11 + d = -12.328828006 Solving for variable 'd'. Move all terms containing d to the left, all other terms to the right. Add '11' to each side of the equation. -11 + 11 + d = -12.328828006 + 11 Combine like terms: -11 + 11 = 0 0 + d = -12.328828006 + 11 d = -12.328828006 + 11 Combine like terms: -12.328828006 + 11 = -1.328828006 d = -1.328828006 Simplifying d = -1.328828006

Solution

The solution to the problem is based on the solutions from the subproblems. d = {23.328828006, -1.328828006}

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