d(8d+1)=40

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Solution for d(8d+1)=40 equation:


Simplifying
d(8d + 1) = 40

Reorder the terms:
d(1 + 8d) = 40
(1 * d + 8d * d) = 40
(1d + 8d2) = 40

Solving
1d + 8d2 = 40

Solving for variable 'd'.

Reorder the terms:
-40 + 1d + 8d2 = 40 + -40

Combine like terms: 40 + -40 = 0
-40 + 1d + 8d2 = 0

Begin completing the square.  Divide all terms by
8 the coefficient of the squared term: 

Divide each side by '8'.
-5 + 0.125d + d2 = 0

Move the constant term to the right:

Add '5' to each side of the equation.
-5 + 0.125d + 5 + d2 = 0 + 5

Reorder the terms:
-5 + 5 + 0.125d + d2 = 0 + 5

Combine like terms: -5 + 5 = 0
0 + 0.125d + d2 = 0 + 5
0.125d + d2 = 0 + 5

Combine like terms: 0 + 5 = 5
0.125d + d2 = 5

The d term is 0.125d.  Take half its coefficient (0.0625).
Square it (0.00390625) and add it to both sides.

Add '0.00390625' to each side of the equation.
0.125d + 0.00390625 + d2 = 5 + 0.00390625

Reorder the terms:
0.00390625 + 0.125d + d2 = 5 + 0.00390625

Combine like terms: 5 + 0.00390625 = 5.00390625
0.00390625 + 0.125d + d2 = 5.00390625

Factor a perfect square on the left side:
(d + 0.0625)(d + 0.0625) = 5.00390625

Calculate the square root of the right side: 2.236941271

Break this problem into two subproblems by setting 
(d + 0.0625) equal to 2.236941271 and -2.236941271.

Subproblem 1

d + 0.0625 = 2.236941271 Simplifying d + 0.0625 = 2.236941271 Reorder the terms: 0.0625 + d = 2.236941271 Solving 0.0625 + d = 2.236941271 Solving for variable 'd'. Move all terms containing d to the left, all other terms to the right. Add '-0.0625' to each side of the equation. 0.0625 + -0.0625 + d = 2.236941271 + -0.0625 Combine like terms: 0.0625 + -0.0625 = 0.0000 0.0000 + d = 2.236941271 + -0.0625 d = 2.236941271 + -0.0625 Combine like terms: 2.236941271 + -0.0625 = 2.174441271 d = 2.174441271 Simplifying d = 2.174441271

Subproblem 2

d + 0.0625 = -2.236941271 Simplifying d + 0.0625 = -2.236941271 Reorder the terms: 0.0625 + d = -2.236941271 Solving 0.0625 + d = -2.236941271 Solving for variable 'd'. Move all terms containing d to the left, all other terms to the right. Add '-0.0625' to each side of the equation. 0.0625 + -0.0625 + d = -2.236941271 + -0.0625 Combine like terms: 0.0625 + -0.0625 = 0.0000 0.0000 + d = -2.236941271 + -0.0625 d = -2.236941271 + -0.0625 Combine like terms: -2.236941271 + -0.0625 = -2.299441271 d = -2.299441271 Simplifying d = -2.299441271

Solution

The solution to the problem is based on the solutions from the subproblems. d = {2.174441271, -2.299441271}

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