10(c+2)c=7

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Solution for 10(c+2)c=7 equation:


Simplifying
10(c + 2) * c = 7

Reorder the terms:
10(2 + c) * c = 7

Reorder the terms for easier multiplication:
10c(2 + c) = 7
(2 * 10c + c * 10c) = 7
(20c + 10c2) = 7

Solving
20c + 10c2 = 7

Solving for variable 'c'.

Reorder the terms:
-7 + 20c + 10c2 = 7 + -7

Combine like terms: 7 + -7 = 0
-7 + 20c + 10c2 = 0

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

Divide each side by '10'.
-0.7 + 2c + c2 = 0

Move the constant term to the right:

Add '0.7' to each side of the equation.
-0.7 + 2c + 0.7 + c2 = 0 + 0.7

Reorder the terms:
-0.7 + 0.7 + 2c + c2 = 0 + 0.7

Combine like terms: -0.7 + 0.7 = 0.0
0.0 + 2c + c2 = 0 + 0.7
2c + c2 = 0 + 0.7

Combine like terms: 0 + 0.7 = 0.7
2c + c2 = 0.7

The c term is 2c.  Take half its coefficient (1).
Square it (1) and add it to both sides.

Add '1' to each side of the equation.
2c + 1 + c2 = 0.7 + 1

Reorder the terms:
1 + 2c + c2 = 0.7 + 1

Combine like terms: 0.7 + 1 = 1.7
1 + 2c + c2 = 1.7

Factor a perfect square on the left side:
(c + 1)(c + 1) = 1.7

Calculate the square root of the right side: 1.303840481

Break this problem into two subproblems by setting 
(c + 1) equal to 1.303840481 and -1.303840481.

Subproblem 1

c + 1 = 1.303840481 Simplifying c + 1 = 1.303840481 Reorder the terms: 1 + c = 1.303840481 Solving 1 + c = 1.303840481 Solving for variable 'c'. Move all terms containing c to the left, all other terms to the right. Add '-1' to each side of the equation. 1 + -1 + c = 1.303840481 + -1 Combine like terms: 1 + -1 = 0 0 + c = 1.303840481 + -1 c = 1.303840481 + -1 Combine like terms: 1.303840481 + -1 = 0.303840481 c = 0.303840481 Simplifying c = 0.303840481

Subproblem 2

c + 1 = -1.303840481 Simplifying c + 1 = -1.303840481 Reorder the terms: 1 + c = -1.303840481 Solving 1 + c = -1.303840481 Solving for variable 'c'. Move all terms containing c to the left, all other terms to the right. Add '-1' to each side of the equation. 1 + -1 + c = -1.303840481 + -1 Combine like terms: 1 + -1 = 0 0 + c = -1.303840481 + -1 c = -1.303840481 + -1 Combine like terms: -1.303840481 + -1 = -2.303840481 c = -2.303840481 Simplifying c = -2.303840481

Solution

The solution to the problem is based on the solutions from the subproblems. c = {0.303840481, -2.303840481}

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