1-3x=2x(x+5)

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Solution for 1-3x=2x(x+5) equation:


Simplifying
1 + -3x = 2x(x + 5)

Reorder the terms:
1 + -3x = 2x(5 + x)
1 + -3x = (5 * 2x + x * 2x)
1 + -3x = (10x + 2x2)

Solving
1 + -3x = 10x + 2x2

Solving for variable 'x'.

Combine like terms: -3x + -10x = -13x
1 + -13x + -2x2 = 10x + 2x2 + -10x + -2x2

Reorder the terms:
1 + -13x + -2x2 = 10x + -10x + 2x2 + -2x2

Combine like terms: 10x + -10x = 0
1 + -13x + -2x2 = 0 + 2x2 + -2x2
1 + -13x + -2x2 = 2x2 + -2x2

Combine like terms: 2x2 + -2x2 = 0
1 + -13x + -2x2 = 0

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

Divide each side by '-2'.
-0.5 + 6.5x + x2 = 0

Move the constant term to the right:

Add '0.5' to each side of the equation.
-0.5 + 6.5x + 0.5 + x2 = 0 + 0.5

Reorder the terms:
-0.5 + 0.5 + 6.5x + x2 = 0 + 0.5

Combine like terms: -0.5 + 0.5 = 0.0
0.0 + 6.5x + x2 = 0 + 0.5
6.5x + x2 = 0 + 0.5

Combine like terms: 0 + 0.5 = 0.5
6.5x + x2 = 0.5

The x term is 6.5x.  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.
6.5x + 10.5625 + x2 = 0.5 + 10.5625

Reorder the terms:
10.5625 + 6.5x + x2 = 0.5 + 10.5625

Combine like terms: 0.5 + 10.5625 = 11.0625
10.5625 + 6.5x + x2 = 11.0625

Factor a perfect square on the left side:
(x + 3.25)(x + 3.25) = 11.0625

Calculate the square root of the right side: 3.326033674

Break this problem into two subproblems by setting 
(x + 3.25) equal to 3.326033674 and -3.326033674.

Subproblem 1

x + 3.25 = 3.326033674 Simplifying x + 3.25 = 3.326033674 Reorder the terms: 3.25 + x = 3.326033674 Solving 3.25 + x = 3.326033674 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-3.25' to each side of the equation. 3.25 + -3.25 + x = 3.326033674 + -3.25 Combine like terms: 3.25 + -3.25 = 0.00 0.00 + x = 3.326033674 + -3.25 x = 3.326033674 + -3.25 Combine like terms: 3.326033674 + -3.25 = 0.076033674 x = 0.076033674 Simplifying x = 0.076033674

Subproblem 2

x + 3.25 = -3.326033674 Simplifying x + 3.25 = -3.326033674 Reorder the terms: 3.25 + x = -3.326033674 Solving 3.25 + x = -3.326033674 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-3.25' to each side of the equation. 3.25 + -3.25 + x = -3.326033674 + -3.25 Combine like terms: 3.25 + -3.25 = 0.00 0.00 + x = -3.326033674 + -3.25 x = -3.326033674 + -3.25 Combine like terms: -3.326033674 + -3.25 = -6.576033674 x = -6.576033674 Simplifying x = -6.576033674

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.076033674, -6.576033674}

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