4c^2-28c+5=0

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Solution for 4c^2-28c+5=0 equation:


Simplifying
4c2 + -28c + 5 = 0

Reorder the terms:
5 + -28c + 4c2 = 0

Solving
5 + -28c + 4c2 = 0

Solving for variable 'c'.

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

Divide each side by '4'.
1.25 + -7c + c2 = 0

Move the constant term to the right:

Add '-1.25' to each side of the equation.
1.25 + -7c + -1.25 + c2 = 0 + -1.25

Reorder the terms:
1.25 + -1.25 + -7c + c2 = 0 + -1.25

Combine like terms: 1.25 + -1.25 = 0.00
0.00 + -7c + c2 = 0 + -1.25
-7c + c2 = 0 + -1.25

Combine like terms: 0 + -1.25 = -1.25
-7c + c2 = -1.25

The c term is -7c.  Take half its coefficient (-3.5).
Square it (12.25) and add it to both sides.

Add '12.25' to each side of the equation.
-7c + 12.25 + c2 = -1.25 + 12.25

Reorder the terms:
12.25 + -7c + c2 = -1.25 + 12.25

Combine like terms: -1.25 + 12.25 = 11
12.25 + -7c + c2 = 11

Factor a perfect square on the left side:
(c + -3.5)(c + -3.5) = 11

Calculate the square root of the right side: 3.31662479

Break this problem into two subproblems by setting 
(c + -3.5) equal to 3.31662479 and -3.31662479.

Subproblem 1

c + -3.5 = 3.31662479 Simplifying c + -3.5 = 3.31662479 Reorder the terms: -3.5 + c = 3.31662479 Solving -3.5 + c = 3.31662479 Solving for variable 'c'. Move all terms containing c to the left, all other terms to the right. Add '3.5' to each side of the equation. -3.5 + 3.5 + c = 3.31662479 + 3.5 Combine like terms: -3.5 + 3.5 = 0.0 0.0 + c = 3.31662479 + 3.5 c = 3.31662479 + 3.5 Combine like terms: 3.31662479 + 3.5 = 6.81662479 c = 6.81662479 Simplifying c = 6.81662479

Subproblem 2

c + -3.5 = -3.31662479 Simplifying c + -3.5 = -3.31662479 Reorder the terms: -3.5 + c = -3.31662479 Solving -3.5 + c = -3.31662479 Solving for variable 'c'. Move all terms containing c to the left, all other terms to the right. Add '3.5' to each side of the equation. -3.5 + 3.5 + c = -3.31662479 + 3.5 Combine like terms: -3.5 + 3.5 = 0.0 0.0 + c = -3.31662479 + 3.5 c = -3.31662479 + 3.5 Combine like terms: -3.31662479 + 3.5 = 0.18337521 c = 0.18337521 Simplifying c = 0.18337521

Solution

The solution to the problem is based on the solutions from the subproblems. c = {6.81662479, 0.18337521}

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