-3.5d^2+364d-965=5135.50

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Solution for -3.5d^2+364d-965=5135.50 equation:


Simplifying
-3.5d2 + 364d + -965 = 5135.50

Reorder the terms:
-965 + 364d + -3.5d2 = 5135.50

Solving
-965 + 364d + -3.5d2 = 5135.50

Solving for variable 'd'.

Reorder the terms:
-965 + -5135.50 + 364d + -3.5d2 = 5135.50 + -5135.50

Combine like terms: -965 + -5135.50 = -6100.5
-6100.5 + 364d + -3.5d2 = 5135.50 + -5135.50

Combine like terms: 5135.50 + -5135.50 = 0.00
-6100.5 + 364d + -3.5d2 = 0.00

Begin completing the square.  Divide all terms by
-3.5 the coefficient of the squared term: 

Divide each side by '-3.5'.
1743 + -104d + d2 = 0.0

Move the constant term to the right:

Add '-1743' to each side of the equation.
1743 + -104d + -1743 + d2 = 0.0 + -1743

Reorder the terms:
1743 + -1743 + -104d + d2 = 0.0 + -1743

Combine like terms: 1743 + -1743 = 0
0 + -104d + d2 = 0.0 + -1743
-104d + d2 = 0.0 + -1743

Combine like terms: 0.0 + -1743 = -1743
-104d + d2 = -1743

The d term is -104d.  Take half its coefficient (-52).
Square it (2704) and add it to both sides.

Add '2704' to each side of the equation.
-104d + 2704 + d2 = -1743 + 2704

Reorder the terms:
2704 + -104d + d2 = -1743 + 2704

Combine like terms: -1743 + 2704 = 961
2704 + -104d + d2 = 961

Factor a perfect square on the left side:
(d + -52)(d + -52) = 961

Calculate the square root of the right side: 31

Break this problem into two subproblems by setting 
(d + -52) equal to 31 and -31.

Subproblem 1

d + -52 = 31 Simplifying d + -52 = 31 Reorder the terms: -52 + d = 31 Solving -52 + d = 31 Solving for variable 'd'. Move all terms containing d to the left, all other terms to the right. Add '52' to each side of the equation. -52 + 52 + d = 31 + 52 Combine like terms: -52 + 52 = 0 0 + d = 31 + 52 d = 31 + 52 Combine like terms: 31 + 52 = 83 d = 83 Simplifying d = 83

Subproblem 2

d + -52 = -31 Simplifying d + -52 = -31 Reorder the terms: -52 + d = -31 Solving -52 + d = -31 Solving for variable 'd'. Move all terms containing d to the left, all other terms to the right. Add '52' to each side of the equation. -52 + 52 + d = -31 + 52 Combine like terms: -52 + 52 = 0 0 + d = -31 + 52 d = -31 + 52 Combine like terms: -31 + 52 = 21 d = 21 Simplifying d = 21

Solution

The solution to the problem is based on the solutions from the subproblems. d = {83, 21}

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