d^2-14d=5

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Solution for d^2-14d=5 equation:


Simplifying
d2 + -14d = 5

Reorder the terms:
-14d + d2 = 5

Solving
-14d + d2 = 5

Solving for variable 'd'.

Reorder the terms:
-5 + -14d + d2 = 5 + -5

Combine like terms: 5 + -5 = 0
-5 + -14d + d2 = 0

Begin completing the square.

Move the constant term to the right:

Add '5' to each side of the equation.
-5 + -14d + 5 + d2 = 0 + 5

Reorder the terms:
-5 + 5 + -14d + d2 = 0 + 5

Combine like terms: -5 + 5 = 0
0 + -14d + d2 = 0 + 5
-14d + d2 = 0 + 5

Combine like terms: 0 + 5 = 5
-14d + d2 = 5

The d term is -14d.  Take half its coefficient (-7).
Square it (49) and add it to both sides.

Add '49' to each side of the equation.
-14d + 49 + d2 = 5 + 49

Reorder the terms:
49 + -14d + d2 = 5 + 49

Combine like terms: 5 + 49 = 54
49 + -14d + d2 = 54

Factor a perfect square on the left side:
(d + -7)(d + -7) = 54

Calculate the square root of the right side: 7.348469228

Break this problem into two subproblems by setting 
(d + -7) equal to 7.348469228 and -7.348469228.

Subproblem 1

d + -7 = 7.348469228 Simplifying d + -7 = 7.348469228 Reorder the terms: -7 + d = 7.348469228 Solving -7 + d = 7.348469228 Solving for variable 'd'. Move all terms containing d to the left, all other terms to the right. Add '7' to each side of the equation. -7 + 7 + d = 7.348469228 + 7 Combine like terms: -7 + 7 = 0 0 + d = 7.348469228 + 7 d = 7.348469228 + 7 Combine like terms: 7.348469228 + 7 = 14.348469228 d = 14.348469228 Simplifying d = 14.348469228

Subproblem 2

d + -7 = -7.348469228 Simplifying d + -7 = -7.348469228 Reorder the terms: -7 + d = -7.348469228 Solving -7 + d = -7.348469228 Solving for variable 'd'. Move all terms containing d to the left, all other terms to the right. Add '7' to each side of the equation. -7 + 7 + d = -7.348469228 + 7 Combine like terms: -7 + 7 = 0 0 + d = -7.348469228 + 7 d = -7.348469228 + 7 Combine like terms: -7.348469228 + 7 = -0.348469228 d = -0.348469228 Simplifying d = -0.348469228

Solution

The solution to the problem is based on the solutions from the subproblems. d = {14.348469228, -0.348469228}

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