(41.5+c)(10c+1)=180

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Solution for (41.5+c)(10c+1)=180 equation:


Simplifying
(41.5 + c)(10c + 1) = 180

Reorder the terms:
(41.5 + c)(1 + 10c) = 180

Multiply (41.5 + c) * (1 + 10c)
(41.5(1 + 10c) + c(1 + 10c)) = 180
((1 * 41.5 + 10c * 41.5) + c(1 + 10c)) = 180
((41.5 + 415c) + c(1 + 10c)) = 180
(41.5 + 415c + (1 * c + 10c * c)) = 180
(41.5 + 415c + (1c + 10c2)) = 180

Combine like terms: 415c + 1c = 416c
(41.5 + 416c + 10c2) = 180

Solving
41.5 + 416c + 10c2 = 180

Solving for variable 'c'.

Reorder the terms:
41.5 + -180 + 416c + 10c2 = 180 + -180

Combine like terms: 41.5 + -180 = -138.5
-138.5 + 416c + 10c2 = 180 + -180

Combine like terms: 180 + -180 = 0
-138.5 + 416c + 10c2 = 0

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

Divide each side by '10'.
-13.85 + 41.6c + c2 = 0

Move the constant term to the right:

Add '13.85' to each side of the equation.
-13.85 + 41.6c + 13.85 + c2 = 0 + 13.85

Reorder the terms:
-13.85 + 13.85 + 41.6c + c2 = 0 + 13.85

Combine like terms: -13.85 + 13.85 = 0.00
0.00 + 41.6c + c2 = 0 + 13.85
41.6c + c2 = 0 + 13.85

Combine like terms: 0 + 13.85 = 13.85
41.6c + c2 = 13.85

The c term is 41.6c.  Take half its coefficient (20.8).
Square it (432.64) and add it to both sides.

Add '432.64' to each side of the equation.
41.6c + 432.64 + c2 = 13.85 + 432.64

Reorder the terms:
432.64 + 41.6c + c2 = 13.85 + 432.64

Combine like terms: 13.85 + 432.64 = 446.49
432.64 + 41.6c + c2 = 446.49

Factor a perfect square on the left side:
(c + 20.8)(c + 20.8) = 446.49

Calculate the square root of the right side: 21.130309984

Break this problem into two subproblems by setting 
(c + 20.8) equal to 21.130309984 and -21.130309984.

Subproblem 1

c + 20.8 = 21.130309984 Simplifying c + 20.8 = 21.130309984 Reorder the terms: 20.8 + c = 21.130309984 Solving 20.8 + c = 21.130309984 Solving for variable 'c'. Move all terms containing c to the left, all other terms to the right. Add '-20.8' to each side of the equation. 20.8 + -20.8 + c = 21.130309984 + -20.8 Combine like terms: 20.8 + -20.8 = 0.0 0.0 + c = 21.130309984 + -20.8 c = 21.130309984 + -20.8 Combine like terms: 21.130309984 + -20.8 = 0.330309984 c = 0.330309984 Simplifying c = 0.330309984

Subproblem 2

c + 20.8 = -21.130309984 Simplifying c + 20.8 = -21.130309984 Reorder the terms: 20.8 + c = -21.130309984 Solving 20.8 + c = -21.130309984 Solving for variable 'c'. Move all terms containing c to the left, all other terms to the right. Add '-20.8' to each side of the equation. 20.8 + -20.8 + c = -21.130309984 + -20.8 Combine like terms: 20.8 + -20.8 = 0.0 0.0 + c = -21.130309984 + -20.8 c = -21.130309984 + -20.8 Combine like terms: -21.130309984 + -20.8 = -41.930309984 c = -41.930309984 Simplifying c = -41.930309984

Solution

The solution to the problem is based on the solutions from the subproblems. c = {0.330309984, -41.930309984}

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