d^2+8d+16=5

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Solution for d^2+8d+16=5 equation:


Simplifying
d2 + 8d + 16 = 5

Reorder the terms:
16 + 8d + d2 = 5

Solving
16 + 8d + d2 = 5

Solving for variable 'd'.

Reorder the terms:
16 + -5 + 8d + d2 = 5 + -5

Combine like terms: 16 + -5 = 11
11 + 8d + d2 = 5 + -5

Combine like terms: 5 + -5 = 0
11 + 8d + d2 = 0

Begin completing the square.

Move the constant term to the right:

Add '-11' to each side of the equation.
11 + 8d + -11 + d2 = 0 + -11

Reorder the terms:
11 + -11 + 8d + d2 = 0 + -11

Combine like terms: 11 + -11 = 0
0 + 8d + d2 = 0 + -11
8d + d2 = 0 + -11

Combine like terms: 0 + -11 = -11
8d + d2 = -11

The d term is 8d.  Take half its coefficient (4).
Square it (16) and add it to both sides.

Add '16' to each side of the equation.
8d + 16 + d2 = -11 + 16

Reorder the terms:
16 + 8d + d2 = -11 + 16

Combine like terms: -11 + 16 = 5
16 + 8d + d2 = 5

Factor a perfect square on the left side:
(d + 4)(d + 4) = 5

Calculate the square root of the right side: 2.236067978

Break this problem into two subproblems by setting 
(d + 4) equal to 2.236067978 and -2.236067978.

Subproblem 1

d + 4 = 2.236067978 Simplifying d + 4 = 2.236067978 Reorder the terms: 4 + d = 2.236067978 Solving 4 + d = 2.236067978 Solving for variable 'd'. Move all terms containing d to the left, all other terms to the right. Add '-4' to each side of the equation. 4 + -4 + d = 2.236067978 + -4 Combine like terms: 4 + -4 = 0 0 + d = 2.236067978 + -4 d = 2.236067978 + -4 Combine like terms: 2.236067978 + -4 = -1.763932022 d = -1.763932022 Simplifying d = -1.763932022

Subproblem 2

d + 4 = -2.236067978 Simplifying d + 4 = -2.236067978 Reorder the terms: 4 + d = -2.236067978 Solving 4 + d = -2.236067978 Solving for variable 'd'. Move all terms containing d to the left, all other terms to the right. Add '-4' to each side of the equation. 4 + -4 + d = -2.236067978 + -4 Combine like terms: 4 + -4 = 0 0 + d = -2.236067978 + -4 d = -2.236067978 + -4 Combine like terms: -2.236067978 + -4 = -6.236067978 d = -6.236067978 Simplifying d = -6.236067978

Solution

The solution to the problem is based on the solutions from the subproblems. d = {-1.763932022, -6.236067978}

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