x(x+4)=26

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Solution for x(x+4)=26 equation:


Simplifying
x(x + 4) = 26

Reorder the terms:
x(4 + x) = 26
(4 * x + x * x) = 26
(4x + x2) = 26

Solving
4x + x2 = 26

Solving for variable 'x'.

Reorder the terms:
-26 + 4x + x2 = 26 + -26

Combine like terms: 26 + -26 = 0
-26 + 4x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '26' to each side of the equation.
-26 + 4x + 26 + x2 = 0 + 26

Reorder the terms:
-26 + 26 + 4x + x2 = 0 + 26

Combine like terms: -26 + 26 = 0
0 + 4x + x2 = 0 + 26
4x + x2 = 0 + 26

Combine like terms: 0 + 26 = 26
4x + x2 = 26

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 = 26 + 4

Reorder the terms:
4 + 4x + x2 = 26 + 4

Combine like terms: 26 + 4 = 30
4 + 4x + x2 = 30

Factor a perfect square on the left side:
(x + 2)(x + 2) = 30

Calculate the square root of the right side: 5.477225575

Break this problem into two subproblems by setting 
(x + 2) equal to 5.477225575 and -5.477225575.

Subproblem 1

x + 2 = 5.477225575 Simplifying x + 2 = 5.477225575 Reorder the terms: 2 + x = 5.477225575 Solving 2 + x = 5.477225575 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 = 5.477225575 + -2 Combine like terms: 2 + -2 = 0 0 + x = 5.477225575 + -2 x = 5.477225575 + -2 Combine like terms: 5.477225575 + -2 = 3.477225575 x = 3.477225575 Simplifying x = 3.477225575

Subproblem 2

x + 2 = -5.477225575 Simplifying x + 2 = -5.477225575 Reorder the terms: 2 + x = -5.477225575 Solving 2 + x = -5.477225575 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 = -5.477225575 + -2 Combine like terms: 2 + -2 = 0 0 + x = -5.477225575 + -2 x = -5.477225575 + -2 Combine like terms: -5.477225575 + -2 = -7.477225575 x = -7.477225575 Simplifying x = -7.477225575

Solution

The solution to the problem is based on the solutions from the subproblems. x = {3.477225575, -7.477225575}

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