2d^2-10d+5=0

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Solution for 2d^2-10d+5=0 equation:


Simplifying
2d2 + -10d + 5 = 0

Reorder the terms:
5 + -10d + 2d2 = 0

Solving
5 + -10d + 2d2 = 0

Solving for variable 'd'.

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

Divide each side by '2'.
2.5 + -5d + d2 = 0

Move the constant term to the right:

Add '-2.5' to each side of the equation.
2.5 + -5d + -2.5 + d2 = 0 + -2.5

Reorder the terms:
2.5 + -2.5 + -5d + d2 = 0 + -2.5

Combine like terms: 2.5 + -2.5 = 0.0
0.0 + -5d + d2 = 0 + -2.5
-5d + d2 = 0 + -2.5

Combine like terms: 0 + -2.5 = -2.5
-5d + d2 = -2.5

The d term is -5d.  Take half its coefficient (-2.5).
Square it (6.25) and add it to both sides.

Add '6.25' to each side of the equation.
-5d + 6.25 + d2 = -2.5 + 6.25

Reorder the terms:
6.25 + -5d + d2 = -2.5 + 6.25

Combine like terms: -2.5 + 6.25 = 3.75
6.25 + -5d + d2 = 3.75

Factor a perfect square on the left side:
(d + -2.5)(d + -2.5) = 3.75

Calculate the square root of the right side: 1.936491673

Break this problem into two subproblems by setting 
(d + -2.5) equal to 1.936491673 and -1.936491673.

Subproblem 1

d + -2.5 = 1.936491673 Simplifying d + -2.5 = 1.936491673 Reorder the terms: -2.5 + d = 1.936491673 Solving -2.5 + d = 1.936491673 Solving for variable 'd'. Move all terms containing d to the left, all other terms to the right. Add '2.5' to each side of the equation. -2.5 + 2.5 + d = 1.936491673 + 2.5 Combine like terms: -2.5 + 2.5 = 0.0 0.0 + d = 1.936491673 + 2.5 d = 1.936491673 + 2.5 Combine like terms: 1.936491673 + 2.5 = 4.436491673 d = 4.436491673 Simplifying d = 4.436491673

Subproblem 2

d + -2.5 = -1.936491673 Simplifying d + -2.5 = -1.936491673 Reorder the terms: -2.5 + d = -1.936491673 Solving -2.5 + d = -1.936491673 Solving for variable 'd'. Move all terms containing d to the left, all other terms to the right. Add '2.5' to each side of the equation. -2.5 + 2.5 + d = -1.936491673 + 2.5 Combine like terms: -2.5 + 2.5 = 0.0 0.0 + d = -1.936491673 + 2.5 d = -1.936491673 + 2.5 Combine like terms: -1.936491673 + 2.5 = 0.563508327 d = 0.563508327 Simplifying d = 0.563508327

Solution

The solution to the problem is based on the solutions from the subproblems. d = {4.436491673, 0.563508327}

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