3c^2+12c-11=

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Solution for 3c^2+12c-11= equation:


Simplifying
3c2 + 12c + -11 = 0

Reorder the terms:
-11 + 12c + 3c2 = 0

Solving
-11 + 12c + 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'.
-3.666666667 + 4c + c2 = 0

Move the constant term to the right:

Add '3.666666667' to each side of the equation.
-3.666666667 + 4c + 3.666666667 + c2 = 0 + 3.666666667

Reorder the terms:
-3.666666667 + 3.666666667 + 4c + c2 = 0 + 3.666666667

Combine like terms: -3.666666667 + 3.666666667 = 0.000000000
0.000000000 + 4c + c2 = 0 + 3.666666667
4c + c2 = 0 + 3.666666667

Combine like terms: 0 + 3.666666667 = 3.666666667
4c + c2 = 3.666666667

The c term is 4c.  Take half its coefficient (2).
Square it (4) and add it to both sides.

Add '4' to each side of the equation.
4c + 4 + c2 = 3.666666667 + 4

Reorder the terms:
4 + 4c + c2 = 3.666666667 + 4

Combine like terms: 3.666666667 + 4 = 7.666666667
4 + 4c + c2 = 7.666666667

Factor a perfect square on the left side:
(c + 2)(c + 2) = 7.666666667

Calculate the square root of the right side: 2.768874621

Break this problem into two subproblems by setting 
(c + 2) equal to 2.768874621 and -2.768874621.

Subproblem 1

c + 2 = 2.768874621 Simplifying c + 2 = 2.768874621 Reorder the terms: 2 + c = 2.768874621 Solving 2 + c = 2.768874621 Solving for variable 'c'. Move all terms containing c to the left, all other terms to the right. Add '-2' to each side of the equation. 2 + -2 + c = 2.768874621 + -2 Combine like terms: 2 + -2 = 0 0 + c = 2.768874621 + -2 c = 2.768874621 + -2 Combine like terms: 2.768874621 + -2 = 0.768874621 c = 0.768874621 Simplifying c = 0.768874621

Subproblem 2

c + 2 = -2.768874621 Simplifying c + 2 = -2.768874621 Reorder the terms: 2 + c = -2.768874621 Solving 2 + c = -2.768874621 Solving for variable 'c'. Move all terms containing c to the left, all other terms to the right. Add '-2' to each side of the equation. 2 + -2 + c = -2.768874621 + -2 Combine like terms: 2 + -2 = 0 0 + c = -2.768874621 + -2 c = -2.768874621 + -2 Combine like terms: -2.768874621 + -2 = -4.768874621 c = -4.768874621 Simplifying c = -4.768874621

Solution

The solution to the problem is based on the solutions from the subproblems. c = {0.768874621, -4.768874621}

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