c*c+3c=55

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Solution for c*c+3c=55 equation:


Simplifying
c * c + 3c = 55

Multiply c * c
c2 + 3c = 55

Reorder the terms:
3c + c2 = 55

Solving
3c + c2 = 55

Solving for variable 'c'.

Reorder the terms:
-55 + 3c + c2 = 55 + -55

Combine like terms: 55 + -55 = 0
-55 + 3c + c2 = 0

Begin completing the square.

Move the constant term to the right:

Add '55' to each side of the equation.
-55 + 3c + 55 + c2 = 0 + 55

Reorder the terms:
-55 + 55 + 3c + c2 = 0 + 55

Combine like terms: -55 + 55 = 0
0 + 3c + c2 = 0 + 55
3c + c2 = 0 + 55

Combine like terms: 0 + 55 = 55
3c + c2 = 55

The c term is 3c.  Take half its coefficient (1.5).
Square it (2.25) and add it to both sides.

Add '2.25' to each side of the equation.
3c + 2.25 + c2 = 55 + 2.25

Reorder the terms:
2.25 + 3c + c2 = 55 + 2.25

Combine like terms: 55 + 2.25 = 57.25
2.25 + 3c + c2 = 57.25

Factor a perfect square on the left side:
(c + 1.5)(c + 1.5) = 57.25

Calculate the square root of the right side: 7.566372975

Break this problem into two subproblems by setting 
(c + 1.5) equal to 7.566372975 and -7.566372975.

Subproblem 1

c + 1.5 = 7.566372975 Simplifying c + 1.5 = 7.566372975 Reorder the terms: 1.5 + c = 7.566372975 Solving 1.5 + c = 7.566372975 Solving for variable 'c'. Move all terms containing c to the left, all other terms to the right. Add '-1.5' to each side of the equation. 1.5 + -1.5 + c = 7.566372975 + -1.5 Combine like terms: 1.5 + -1.5 = 0.0 0.0 + c = 7.566372975 + -1.5 c = 7.566372975 + -1.5 Combine like terms: 7.566372975 + -1.5 = 6.066372975 c = 6.066372975 Simplifying c = 6.066372975

Subproblem 2

c + 1.5 = -7.566372975 Simplifying c + 1.5 = -7.566372975 Reorder the terms: 1.5 + c = -7.566372975 Solving 1.5 + c = -7.566372975 Solving for variable 'c'. Move all terms containing c to the left, all other terms to the right. Add '-1.5' to each side of the equation. 1.5 + -1.5 + c = -7.566372975 + -1.5 Combine like terms: 1.5 + -1.5 = 0.0 0.0 + c = -7.566372975 + -1.5 c = -7.566372975 + -1.5 Combine like terms: -7.566372975 + -1.5 = -9.066372975 c = -9.066372975 Simplifying c = -9.066372975

Solution

The solution to the problem is based on the solutions from the subproblems. c = {6.066372975, -9.066372975}

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