5x(3+8+3x-x)=19-15+2x

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Solution for 5x(3+8+3x-x)=19-15+2x equation:


Simplifying
5x(3 + 8 + 3x + -1x) = 19 + -15 + 2x

Combine like terms: 3 + 8 = 11
5x(11 + 3x + -1x) = 19 + -15 + 2x

Combine like terms: 3x + -1x = 2x
5x(11 + 2x) = 19 + -15 + 2x
(11 * 5x + 2x * 5x) = 19 + -15 + 2x
(55x + 10x2) = 19 + -15 + 2x

Combine like terms: 19 + -15 = 4
55x + 10x2 = 4 + 2x

Solving
55x + 10x2 = 4 + 2x

Solving for variable 'x'.

Reorder the terms:
-4 + 55x + -2x + 10x2 = 4 + 2x + -4 + -2x

Combine like terms: 55x + -2x = 53x
-4 + 53x + 10x2 = 4 + 2x + -4 + -2x

Reorder the terms:
-4 + 53x + 10x2 = 4 + -4 + 2x + -2x

Combine like terms: 4 + -4 = 0
-4 + 53x + 10x2 = 0 + 2x + -2x
-4 + 53x + 10x2 = 2x + -2x

Combine like terms: 2x + -2x = 0
-4 + 53x + 10x2 = 0

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

Divide each side by '10'.
-0.4 + 5.3x + x2 = 0.0

Move the constant term to the right:

Add '0.4' to each side of the equation.
-0.4 + 5.3x + 0.4 + x2 = 0.0 + 0.4

Reorder the terms:
-0.4 + 0.4 + 5.3x + x2 = 0.0 + 0.4

Combine like terms: -0.4 + 0.4 = 0.0
0.0 + 5.3x + x2 = 0.0 + 0.4
5.3x + x2 = 0.0 + 0.4

Combine like terms: 0.0 + 0.4 = 0.4
5.3x + x2 = 0.4

The x term is 5.3x.  Take half its coefficient (2.65).
Square it (7.0225) and add it to both sides.

Add '7.0225' to each side of the equation.
5.3x + 7.0225 + x2 = 0.4 + 7.0225

Reorder the terms:
7.0225 + 5.3x + x2 = 0.4 + 7.0225

Combine like terms: 0.4 + 7.0225 = 7.4225
7.0225 + 5.3x + x2 = 7.4225

Factor a perfect square on the left side:
(x + 2.65)(x + 2.65) = 7.4225

Calculate the square root of the right side: 2.724426545

Break this problem into two subproblems by setting 
(x + 2.65) equal to 2.724426545 and -2.724426545.

Subproblem 1

x + 2.65 = 2.724426545 Simplifying x + 2.65 = 2.724426545 Reorder the terms: 2.65 + x = 2.724426545 Solving 2.65 + x = 2.724426545 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-2.65' to each side of the equation. 2.65 + -2.65 + x = 2.724426545 + -2.65 Combine like terms: 2.65 + -2.65 = 0.00 0.00 + x = 2.724426545 + -2.65 x = 2.724426545 + -2.65 Combine like terms: 2.724426545 + -2.65 = 0.074426545 x = 0.074426545 Simplifying x = 0.074426545

Subproblem 2

x + 2.65 = -2.724426545 Simplifying x + 2.65 = -2.724426545 Reorder the terms: 2.65 + x = -2.724426545 Solving 2.65 + x = -2.724426545 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-2.65' to each side of the equation. 2.65 + -2.65 + x = -2.724426545 + -2.65 Combine like terms: 2.65 + -2.65 = 0.00 0.00 + x = -2.724426545 + -2.65 x = -2.724426545 + -2.65 Combine like terms: -2.724426545 + -2.65 = -5.374426545 x = -5.374426545 Simplifying x = -5.374426545

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.074426545, -5.374426545}

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