3c+4=2c(c-5)

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Solution for 3c+4=2c(c-5) equation:


Simplifying
3c + 4 = 2c(c + -5)

Reorder the terms:
4 + 3c = 2c(c + -5)

Reorder the terms:
4 + 3c = 2c(-5 + c)
4 + 3c = (-5 * 2c + c * 2c)
4 + 3c = (-10c + 2c2)

Solving
4 + 3c = -10c + 2c2

Solving for variable 'c'.

Combine like terms: 3c + 10c = 13c
4 + 13c + -2c2 = -10c + 2c2 + 10c + -2c2

Reorder the terms:
4 + 13c + -2c2 = -10c + 10c + 2c2 + -2c2

Combine like terms: -10c + 10c = 0
4 + 13c + -2c2 = 0 + 2c2 + -2c2
4 + 13c + -2c2 = 2c2 + -2c2

Combine like terms: 2c2 + -2c2 = 0
4 + 13c + -2c2 = 0

Begin completing the square.  Divide all terms by
-2 the coefficient of the squared term: 

Divide each side by '-2'.
-2 + -6.5c + c2 = 0

Move the constant term to the right:

Add '2' to each side of the equation.
-2 + -6.5c + 2 + c2 = 0 + 2

Reorder the terms:
-2 + 2 + -6.5c + c2 = 0 + 2

Combine like terms: -2 + 2 = 0
0 + -6.5c + c2 = 0 + 2
-6.5c + c2 = 0 + 2

Combine like terms: 0 + 2 = 2
-6.5c + c2 = 2

The c term is -6.5c.  Take half its coefficient (-3.25).
Square it (10.5625) and add it to both sides.

Add '10.5625' to each side of the equation.
-6.5c + 10.5625 + c2 = 2 + 10.5625

Reorder the terms:
10.5625 + -6.5c + c2 = 2 + 10.5625

Combine like terms: 2 + 10.5625 = 12.5625
10.5625 + -6.5c + c2 = 12.5625

Factor a perfect square on the left side:
(c + -3.25)(c + -3.25) = 12.5625

Calculate the square root of the right side: 3.54436172

Break this problem into two subproblems by setting 
(c + -3.25) equal to 3.54436172 and -3.54436172.

Subproblem 1

c + -3.25 = 3.54436172 Simplifying c + -3.25 = 3.54436172 Reorder the terms: -3.25 + c = 3.54436172 Solving -3.25 + c = 3.54436172 Solving for variable 'c'. Move all terms containing c to the left, all other terms to the right. Add '3.25' to each side of the equation. -3.25 + 3.25 + c = 3.54436172 + 3.25 Combine like terms: -3.25 + 3.25 = 0.00 0.00 + c = 3.54436172 + 3.25 c = 3.54436172 + 3.25 Combine like terms: 3.54436172 + 3.25 = 6.79436172 c = 6.79436172 Simplifying c = 6.79436172

Subproblem 2

c + -3.25 = -3.54436172 Simplifying c + -3.25 = -3.54436172 Reorder the terms: -3.25 + c = -3.54436172 Solving -3.25 + c = -3.54436172 Solving for variable 'c'. Move all terms containing c to the left, all other terms to the right. Add '3.25' to each side of the equation. -3.25 + 3.25 + c = -3.54436172 + 3.25 Combine like terms: -3.25 + 3.25 = 0.00 0.00 + c = -3.54436172 + 3.25 c = -3.54436172 + 3.25 Combine like terms: -3.54436172 + 3.25 = -0.29436172 c = -0.29436172 Simplifying c = -0.29436172

Solution

The solution to the problem is based on the solutions from the subproblems. c = {6.79436172, -0.29436172}

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