5d^2-112d+80=0

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Solution for 5d^2-112d+80=0 equation:


Simplifying
5d2 + -112d + 80 = 0

Reorder the terms:
80 + -112d + 5d2 = 0

Solving
80 + -112d + 5d2 = 0

Solving for variable 'd'.

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

Divide each side by '5'.
16 + -22.4d + d2 = 0

Move the constant term to the right:

Add '-16' to each side of the equation.
16 + -22.4d + -16 + d2 = 0 + -16

Reorder the terms:
16 + -16 + -22.4d + d2 = 0 + -16

Combine like terms: 16 + -16 = 0
0 + -22.4d + d2 = 0 + -16
-22.4d + d2 = 0 + -16

Combine like terms: 0 + -16 = -16
-22.4d + d2 = -16

The d term is -22.4d.  Take half its coefficient (-11.2).
Square it (125.44) and add it to both sides.

Add '125.44' to each side of the equation.
-22.4d + 125.44 + d2 = -16 + 125.44

Reorder the terms:
125.44 + -22.4d + d2 = -16 + 125.44

Combine like terms: -16 + 125.44 = 109.44
125.44 + -22.4d + d2 = 109.44

Factor a perfect square on the left side:
(d + -11.2)(d + -11.2) = 109.44

Calculate the square root of the right side: 10.461357464

Break this problem into two subproblems by setting 
(d + -11.2) equal to 10.461357464 and -10.461357464.

Subproblem 1

d + -11.2 = 10.461357464 Simplifying d + -11.2 = 10.461357464 Reorder the terms: -11.2 + d = 10.461357464 Solving -11.2 + d = 10.461357464 Solving for variable 'd'. Move all terms containing d to the left, all other terms to the right. Add '11.2' to each side of the equation. -11.2 + 11.2 + d = 10.461357464 + 11.2 Combine like terms: -11.2 + 11.2 = 0.0 0.0 + d = 10.461357464 + 11.2 d = 10.461357464 + 11.2 Combine like terms: 10.461357464 + 11.2 = 21.661357464 d = 21.661357464 Simplifying d = 21.661357464

Subproblem 2

d + -11.2 = -10.461357464 Simplifying d + -11.2 = -10.461357464 Reorder the terms: -11.2 + d = -10.461357464 Solving -11.2 + d = -10.461357464 Solving for variable 'd'. Move all terms containing d to the left, all other terms to the right. Add '11.2' to each side of the equation. -11.2 + 11.2 + d = -10.461357464 + 11.2 Combine like terms: -11.2 + 11.2 = 0.0 0.0 + d = -10.461357464 + 11.2 d = -10.461357464 + 11.2 Combine like terms: -10.461357464 + 11.2 = 0.738642536 d = 0.738642536 Simplifying d = 0.738642536

Solution

The solution to the problem is based on the solutions from the subproblems. d = {21.661357464, 0.738642536}

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