5c^2+7c+5=6

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Solution for 5c^2+7c+5=6 equation:


Simplifying
5c2 + 7c + 5 = 6

Reorder the terms:
5 + 7c + 5c2 = 6

Solving
5 + 7c + 5c2 = 6

Solving for variable 'c'.

Reorder the terms:
5 + -6 + 7c + 5c2 = 6 + -6

Combine like terms: 5 + -6 = -1
-1 + 7c + 5c2 = 6 + -6

Combine like terms: 6 + -6 = 0
-1 + 7c + 5c2 = 0

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

Divide each side by '5'.
-0.2 + 1.4c + c2 = 0

Move the constant term to the right:

Add '0.2' to each side of the equation.
-0.2 + 1.4c + 0.2 + c2 = 0 + 0.2

Reorder the terms:
-0.2 + 0.2 + 1.4c + c2 = 0 + 0.2

Combine like terms: -0.2 + 0.2 = 0.0
0.0 + 1.4c + c2 = 0 + 0.2
1.4c + c2 = 0 + 0.2

Combine like terms: 0 + 0.2 = 0.2
1.4c + c2 = 0.2

The c term is 1.4c.  Take half its coefficient (0.7).
Square it (0.49) and add it to both sides.

Add '0.49' to each side of the equation.
1.4c + 0.49 + c2 = 0.2 + 0.49

Reorder the terms:
0.49 + 1.4c + c2 = 0.2 + 0.49

Combine like terms: 0.2 + 0.49 = 0.69
0.49 + 1.4c + c2 = 0.69

Factor a perfect square on the left side:
(c + 0.7)(c + 0.7) = 0.69

Calculate the square root of the right side: 0.830662386

Break this problem into two subproblems by setting 
(c + 0.7) equal to 0.830662386 and -0.830662386.

Subproblem 1

c + 0.7 = 0.830662386 Simplifying c + 0.7 = 0.830662386 Reorder the terms: 0.7 + c = 0.830662386 Solving 0.7 + c = 0.830662386 Solving for variable 'c'. Move all terms containing c to the left, all other terms to the right. Add '-0.7' to each side of the equation. 0.7 + -0.7 + c = 0.830662386 + -0.7 Combine like terms: 0.7 + -0.7 = 0.0 0.0 + c = 0.830662386 + -0.7 c = 0.830662386 + -0.7 Combine like terms: 0.830662386 + -0.7 = 0.130662386 c = 0.130662386 Simplifying c = 0.130662386

Subproblem 2

c + 0.7 = -0.830662386 Simplifying c + 0.7 = -0.830662386 Reorder the terms: 0.7 + c = -0.830662386 Solving 0.7 + c = -0.830662386 Solving for variable 'c'. Move all terms containing c to the left, all other terms to the right. Add '-0.7' to each side of the equation. 0.7 + -0.7 + c = -0.830662386 + -0.7 Combine like terms: 0.7 + -0.7 = 0.0 0.0 + c = -0.830662386 + -0.7 c = -0.830662386 + -0.7 Combine like terms: -0.830662386 + -0.7 = -1.530662386 c = -1.530662386 Simplifying c = -1.530662386

Solution

The solution to the problem is based on the solutions from the subproblems. c = {0.130662386, -1.530662386}

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