5000*d^2+15*d-16=0

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Solution for 5000*d^2+15*d-16=0 equation:


Simplifying
5000d2 + 15d + -16 = 0

Reorder the terms:
-16 + 15d + 5000d2 = 0

Solving
-16 + 15d + 5000d2 = 0

Solving for variable 'd'.

Begin completing the square.  Divide all terms by
5000 the coefficient of the squared term: 

Divide each side by '5000'.
-0.0032 + 0.003d + d2 = 0

Move the constant term to the right:

Add '0.0032' to each side of the equation.
-0.0032 + 0.003d + 0.0032 + d2 = 0 + 0.0032

Reorder the terms:
-0.0032 + 0.0032 + 0.003d + d2 = 0 + 0.0032

Combine like terms: -0.0032 + 0.0032 = 0.0000
0.0000 + 0.003d + d2 = 0 + 0.0032
0.003d + d2 = 0 + 0.0032

Combine like terms: 0 + 0.0032 = 0.0032
0.003d + d2 = 0.0032

The d term is 0.003d.  Take half its coefficient (0.0015).
Square it (0.00000225) and add it to both sides.

Add '0.00000225' to each side of the equation.
0.003d + 0.00000225 + d2 = 0.0032 + 0.00000225

Reorder the terms:
0.00000225 + 0.003d + d2 = 0.0032 + 0.00000225

Combine like terms: 0.0032 + 0.00000225 = 0.00320225
0.00000225 + 0.003d + d2 = 0.00320225

Factor a perfect square on the left side:
(d + 0.0015)(d + 0.0015) = 0.00320225

Calculate the square root of the right side: 0.056588426

Break this problem into two subproblems by setting 
(d + 0.0015) equal to 0.056588426 and -0.056588426.

Subproblem 1

d + 0.0015 = 0.056588426 Simplifying d + 0.0015 = 0.056588426 Reorder the terms: 0.0015 + d = 0.056588426 Solving 0.0015 + d = 0.056588426 Solving for variable 'd'. Move all terms containing d to the left, all other terms to the right. Add '-0.0015' to each side of the equation. 0.0015 + -0.0015 + d = 0.056588426 + -0.0015 Combine like terms: 0.0015 + -0.0015 = 0.0000 0.0000 + d = 0.056588426 + -0.0015 d = 0.056588426 + -0.0015 Combine like terms: 0.056588426 + -0.0015 = 0.055088426 d = 0.055088426 Simplifying d = 0.055088426

Subproblem 2

d + 0.0015 = -0.056588426 Simplifying d + 0.0015 = -0.056588426 Reorder the terms: 0.0015 + d = -0.056588426 Solving 0.0015 + d = -0.056588426 Solving for variable 'd'. Move all terms containing d to the left, all other terms to the right. Add '-0.0015' to each side of the equation. 0.0015 + -0.0015 + d = -0.056588426 + -0.0015 Combine like terms: 0.0015 + -0.0015 = 0.0000 0.0000 + d = -0.056588426 + -0.0015 d = -0.056588426 + -0.0015 Combine like terms: -0.056588426 + -0.0015 = -0.058088426 d = -0.058088426 Simplifying d = -0.058088426

Solution

The solution to the problem is based on the solutions from the subproblems. d = {0.055088426, -0.058088426}

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