3c(2c-5)-5(4c+3)=0

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Solution for 3c(2c-5)-5(4c+3)=0 equation:


Simplifying
3c(2c + -5) + -5(4c + 3) = 0

Reorder the terms:
3c(-5 + 2c) + -5(4c + 3) = 0
(-5 * 3c + 2c * 3c) + -5(4c + 3) = 0
(-15c + 6c2) + -5(4c + 3) = 0

Reorder the terms:
-15c + 6c2 + -5(3 + 4c) = 0
-15c + 6c2 + (3 * -5 + 4c * -5) = 0
-15c + 6c2 + (-15 + -20c) = 0

Reorder the terms:
-15 + -15c + -20c + 6c2 = 0

Combine like terms: -15c + -20c = -35c
-15 + -35c + 6c2 = 0

Solving
-15 + -35c + 6c2 = 0

Solving for variable 'c'.

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

Divide each side by '6'.
-2.5 + -5.833333333c + c2 = 0

Move the constant term to the right:

Add '2.5' to each side of the equation.
-2.5 + -5.833333333c + 2.5 + c2 = 0 + 2.5

Reorder the terms:
-2.5 + 2.5 + -5.833333333c + c2 = 0 + 2.5

Combine like terms: -2.5 + 2.5 = 0.0
0.0 + -5.833333333c + c2 = 0 + 2.5
-5.833333333c + c2 = 0 + 2.5

Combine like terms: 0 + 2.5 = 2.5
-5.833333333c + c2 = 2.5

The c term is -5.833333333c.  Take half its coefficient (-2.916666667).
Square it (8.506944446) and add it to both sides.

Add '8.506944446' to each side of the equation.
-5.833333333c + 8.506944446 + c2 = 2.5 + 8.506944446

Reorder the terms:
8.506944446 + -5.833333333c + c2 = 2.5 + 8.506944446

Combine like terms: 2.5 + 8.506944446 = 11.006944446
8.506944446 + -5.833333333c + c2 = 11.006944446

Factor a perfect square on the left side:
(c + -2.916666667)(c + -2.916666667) = 11.006944446

Calculate the square root of the right side: 3.31767154

Break this problem into two subproblems by setting 
(c + -2.916666667) equal to 3.31767154 and -3.31767154.

Subproblem 1

c + -2.916666667 = 3.31767154 Simplifying c + -2.916666667 = 3.31767154 Reorder the terms: -2.916666667 + c = 3.31767154 Solving -2.916666667 + c = 3.31767154 Solving for variable 'c'. Move all terms containing c to the left, all other terms to the right. Add '2.916666667' to each side of the equation. -2.916666667 + 2.916666667 + c = 3.31767154 + 2.916666667 Combine like terms: -2.916666667 + 2.916666667 = 0.000000000 0.000000000 + c = 3.31767154 + 2.916666667 c = 3.31767154 + 2.916666667 Combine like terms: 3.31767154 + 2.916666667 = 6.234338207 c = 6.234338207 Simplifying c = 6.234338207

Subproblem 2

c + -2.916666667 = -3.31767154 Simplifying c + -2.916666667 = -3.31767154 Reorder the terms: -2.916666667 + c = -3.31767154 Solving -2.916666667 + c = -3.31767154 Solving for variable 'c'. Move all terms containing c to the left, all other terms to the right. Add '2.916666667' to each side of the equation. -2.916666667 + 2.916666667 + c = -3.31767154 + 2.916666667 Combine like terms: -2.916666667 + 2.916666667 = 0.000000000 0.000000000 + c = -3.31767154 + 2.916666667 c = -3.31767154 + 2.916666667 Combine like terms: -3.31767154 + 2.916666667 = -0.401004873 c = -0.401004873 Simplifying c = -0.401004873

Solution

The solution to the problem is based on the solutions from the subproblems. c = {6.234338207, -0.401004873}

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