.5c^2+2c+1.5=0

Solution for .5c^2+2c+1.5=0 equation:

Simplifying
0.5c2 + 2c + 1.5 = 0

Reorder the terms:
1.5 + 2c + 0.5c2 = 0

Solving
1.5 + 2c + 0.5c2 = 0

Solving for variable 'c'.

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

Divide each side by '0.5'.
3 + 4c + c2 = 0

Move the constant term to the right:

Add '-3' to each side of the equation.
3 + 4c + -3 + c2 = 0 + -3

Reorder the terms:
3 + -3 + 4c + c2 = 0 + -3

Combine like terms: 3 + -3 = 0
0 + 4c + c2 = 0 + -3
4c + c2 = 0 + -3

Combine like terms: 0 + -3 = -3
4c + c2 = -3

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 + 4

Reorder the terms:
4 + 4c + c2 = -3 + 4

Combine like terms: -3 + 4 = 1
4 + 4c + c2 = 1

Factor a perfect square on the left side:
(c + 2)(c + 2) = 1

Calculate the square root of the right side: 1

Break this problem into two subproblems by setting 
(c + 2) equal to 1 and -1.

Subproblem 1
c + 2 = 1

Simplifying
c + 2 = 1

Reorder the terms:
2 + c = 1

Solving
2 + c = 1

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 = 1 + -2

Combine like terms: 2 + -2 = 0
0 + c = 1 + -2
c = 1 + -2

Combine like terms: 1 + -2 = -1
c = -1

Simplifying
c = -1

Subproblem 2
c + 2 = -1

Simplifying
c + 2 = -1

Reorder the terms:
2 + c = -1

Solving
2 + c = -1

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 = -1 + -2

Combine like terms: 2 + -2 = 0
0 + c = -1 + -2
c = -1 + -2

Combine like terms: -1 + -2 = -3
c = -3

Simplifying
c = -3

Solution
The solution to the problem is based on the solutions
from the subproblems.
c = {-1, -3}