x+2x(x-5)=135

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Solution for x+2x(x-5)=135 equation:


Simplifying
x + 2x(x + -5) = 135

Reorder the terms:
x + 2x(-5 + x) = 135
x + (-5 * 2x + x * 2x) = 135
x + (-10x + 2x2) = 135

Combine like terms: x + -10x = -9x
-9x + 2x2 = 135

Solving
-9x + 2x2 = 135

Solving for variable 'x'.

Reorder the terms:
-135 + -9x + 2x2 = 135 + -135

Combine like terms: 135 + -135 = 0
-135 + -9x + 2x2 = 0

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

Divide each side by '2'.
-67.5 + -4.5x + x2 = 0

Move the constant term to the right:

Add '67.5' to each side of the equation.
-67.5 + -4.5x + 67.5 + x2 = 0 + 67.5

Reorder the terms:
-67.5 + 67.5 + -4.5x + x2 = 0 + 67.5

Combine like terms: -67.5 + 67.5 = 0.0
0.0 + -4.5x + x2 = 0 + 67.5
-4.5x + x2 = 0 + 67.5

Combine like terms: 0 + 67.5 = 67.5
-4.5x + x2 = 67.5

The x term is -4.5x.  Take half its coefficient (-2.25).
Square it (5.0625) and add it to both sides.

Add '5.0625' to each side of the equation.
-4.5x + 5.0625 + x2 = 67.5 + 5.0625

Reorder the terms:
5.0625 + -4.5x + x2 = 67.5 + 5.0625

Combine like terms: 67.5 + 5.0625 = 72.5625
5.0625 + -4.5x + x2 = 72.5625

Factor a perfect square on the left side:
(x + -2.25)(x + -2.25) = 72.5625

Calculate the square root of the right side: 8.518362519

Break this problem into two subproblems by setting 
(x + -2.25) equal to 8.518362519 and -8.518362519.

Subproblem 1

x + -2.25 = 8.518362519 Simplifying x + -2.25 = 8.518362519 Reorder the terms: -2.25 + x = 8.518362519 Solving -2.25 + x = 8.518362519 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '2.25' to each side of the equation. -2.25 + 2.25 + x = 8.518362519 + 2.25 Combine like terms: -2.25 + 2.25 = 0.00 0.00 + x = 8.518362519 + 2.25 x = 8.518362519 + 2.25 Combine like terms: 8.518362519 + 2.25 = 10.768362519 x = 10.768362519 Simplifying x = 10.768362519

Subproblem 2

x + -2.25 = -8.518362519 Simplifying x + -2.25 = -8.518362519 Reorder the terms: -2.25 + x = -8.518362519 Solving -2.25 + x = -8.518362519 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '2.25' to each side of the equation. -2.25 + 2.25 + x = -8.518362519 + 2.25 Combine like terms: -2.25 + 2.25 = 0.00 0.00 + x = -8.518362519 + 2.25 x = -8.518362519 + 2.25 Combine like terms: -8.518362519 + 2.25 = -6.268362519 x = -6.268362519 Simplifying x = -6.268362519

Solution

The solution to the problem is based on the solutions from the subproblems. x = {10.768362519, -6.268362519}

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