x(x+4)=136

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Solution for x(x+4)=136 equation:


Simplifying
x(x + 4) = 136

Reorder the terms:
x(4 + x) = 136
(4 * x + x * x) = 136
(4x + x2) = 136

Solving
4x + x2 = 136

Solving for variable 'x'.

Reorder the terms:
-136 + 4x + x2 = 136 + -136

Combine like terms: 136 + -136 = 0
-136 + 4x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '136' to each side of the equation.
-136 + 4x + 136 + x2 = 0 + 136

Reorder the terms:
-136 + 136 + 4x + x2 = 0 + 136

Combine like terms: -136 + 136 = 0
0 + 4x + x2 = 0 + 136
4x + x2 = 0 + 136

Combine like terms: 0 + 136 = 136
4x + x2 = 136

The x term is 4x.  Take half its coefficient (2).
Square it (4) and add it to both sides.

Add '4' to each side of the equation.
4x + 4 + x2 = 136 + 4

Reorder the terms:
4 + 4x + x2 = 136 + 4

Combine like terms: 136 + 4 = 140
4 + 4x + x2 = 140

Factor a perfect square on the left side:
(x + 2)(x + 2) = 140

Calculate the square root of the right side: 11.832159566

Break this problem into two subproblems by setting 
(x + 2) equal to 11.832159566 and -11.832159566.

Subproblem 1

x + 2 = 11.832159566 Simplifying x + 2 = 11.832159566 Reorder the terms: 2 + x = 11.832159566 Solving 2 + x = 11.832159566 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-2' to each side of the equation. 2 + -2 + x = 11.832159566 + -2 Combine like terms: 2 + -2 = 0 0 + x = 11.832159566 + -2 x = 11.832159566 + -2 Combine like terms: 11.832159566 + -2 = 9.832159566 x = 9.832159566 Simplifying x = 9.832159566

Subproblem 2

x + 2 = -11.832159566 Simplifying x + 2 = -11.832159566 Reorder the terms: 2 + x = -11.832159566 Solving 2 + x = -11.832159566 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-2' to each side of the equation. 2 + -2 + x = -11.832159566 + -2 Combine like terms: 2 + -2 = 0 0 + x = -11.832159566 + -2 x = -11.832159566 + -2 Combine like terms: -11.832159566 + -2 = -13.832159566 x = -13.832159566 Simplifying x = -13.832159566

Solution

The solution to the problem is based on the solutions from the subproblems. x = {9.832159566, -13.832159566}

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