3c^2+18c+5=

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Solution for 3c^2+18c+5= equation:


Simplifying
3c2 + 18c + 5 = 0

Reorder the terms:
5 + 18c + 3c2 = 0

Solving
5 + 18c + 3c2 = 0

Solving for variable 'c'.

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

Divide each side by '3'.
1.666666667 + 6c + c2 = 0

Move the constant term to the right:

Add '-1.666666667' to each side of the equation.
1.666666667 + 6c + -1.666666667 + c2 = 0 + -1.666666667

Reorder the terms:
1.666666667 + -1.666666667 + 6c + c2 = 0 + -1.666666667

Combine like terms: 1.666666667 + -1.666666667 = 0.000000000
0.000000000 + 6c + c2 = 0 + -1.666666667
6c + c2 = 0 + -1.666666667

Combine like terms: 0 + -1.666666667 = -1.666666667
6c + c2 = -1.666666667

The c term is 6c.  Take half its coefficient (3).
Square it (9) and add it to both sides.

Add '9' to each side of the equation.
6c + 9 + c2 = -1.666666667 + 9

Reorder the terms:
9 + 6c + c2 = -1.666666667 + 9

Combine like terms: -1.666666667 + 9 = 7.333333333
9 + 6c + c2 = 7.333333333

Factor a perfect square on the left side:
(c + 3)(c + 3) = 7.333333333

Calculate the square root of the right side: 2.708012801

Break this problem into two subproblems by setting 
(c + 3) equal to 2.708012801 and -2.708012801.

Subproblem 1

c + 3 = 2.708012801 Simplifying c + 3 = 2.708012801 Reorder the terms: 3 + c = 2.708012801 Solving 3 + c = 2.708012801 Solving for variable 'c'. Move all terms containing c to the left, all other terms to the right. Add '-3' to each side of the equation. 3 + -3 + c = 2.708012801 + -3 Combine like terms: 3 + -3 = 0 0 + c = 2.708012801 + -3 c = 2.708012801 + -3 Combine like terms: 2.708012801 + -3 = -0.291987199 c = -0.291987199 Simplifying c = -0.291987199

Subproblem 2

c + 3 = -2.708012801 Simplifying c + 3 = -2.708012801 Reorder the terms: 3 + c = -2.708012801 Solving 3 + c = -2.708012801 Solving for variable 'c'. Move all terms containing c to the left, all other terms to the right. Add '-3' to each side of the equation. 3 + -3 + c = -2.708012801 + -3 Combine like terms: 3 + -3 = 0 0 + c = -2.708012801 + -3 c = -2.708012801 + -3 Combine like terms: -2.708012801 + -3 = -5.708012801 c = -5.708012801 Simplifying c = -5.708012801

Solution

The solution to the problem is based on the solutions from the subproblems. c = {-0.291987199, -5.708012801}

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