x(x+5)=106

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Solution for x(x+5)=106 equation:


Simplifying
x(x + 5) = 106

Reorder the terms:
x(5 + x) = 106
(5 * x + x * x) = 106
(5x + x2) = 106

Solving
5x + x2 = 106

Solving for variable 'x'.

Reorder the terms:
-106 + 5x + x2 = 106 + -106

Combine like terms: 106 + -106 = 0
-106 + 5x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '106' to each side of the equation.
-106 + 5x + 106 + x2 = 0 + 106

Reorder the terms:
-106 + 106 + 5x + x2 = 0 + 106

Combine like terms: -106 + 106 = 0
0 + 5x + x2 = 0 + 106
5x + x2 = 0 + 106

Combine like terms: 0 + 106 = 106
5x + x2 = 106

The x term is 5x.  Take half its coefficient (2.5).
Square it (6.25) and add it to both sides.

Add '6.25' to each side of the equation.
5x + 6.25 + x2 = 106 + 6.25

Reorder the terms:
6.25 + 5x + x2 = 106 + 6.25

Combine like terms: 106 + 6.25 = 112.25
6.25 + 5x + x2 = 112.25

Factor a perfect square on the left side:
(x + 2.5)(x + 2.5) = 112.25

Calculate the square root of the right side: 10.59481005

Break this problem into two subproblems by setting 
(x + 2.5) equal to 10.59481005 and -10.59481005.

Subproblem 1

x + 2.5 = 10.59481005 Simplifying x + 2.5 = 10.59481005 Reorder the terms: 2.5 + x = 10.59481005 Solving 2.5 + x = 10.59481005 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-2.5' to each side of the equation. 2.5 + -2.5 + x = 10.59481005 + -2.5 Combine like terms: 2.5 + -2.5 = 0.0 0.0 + x = 10.59481005 + -2.5 x = 10.59481005 + -2.5 Combine like terms: 10.59481005 + -2.5 = 8.09481005 x = 8.09481005 Simplifying x = 8.09481005

Subproblem 2

x + 2.5 = -10.59481005 Simplifying x + 2.5 = -10.59481005 Reorder the terms: 2.5 + x = -10.59481005 Solving 2.5 + x = -10.59481005 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-2.5' to each side of the equation. 2.5 + -2.5 + x = -10.59481005 + -2.5 Combine like terms: 2.5 + -2.5 = 0.0 0.0 + x = -10.59481005 + -2.5 x = -10.59481005 + -2.5 Combine like terms: -10.59481005 + -2.5 = -13.09481005 x = -13.09481005 Simplifying x = -13.09481005

Solution

The solution to the problem is based on the solutions from the subproblems. x = {8.09481005, -13.09481005}

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