x(x+10)=161

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Solution for x(x+10)=161 equation:


Simplifying
x(x + 10) = 161

Reorder the terms:
x(10 + x) = 161
(10 * x + x * x) = 161
(10x + x2) = 161

Solving
10x + x2 = 161

Solving for variable 'x'.

Reorder the terms:
-161 + 10x + x2 = 161 + -161

Combine like terms: 161 + -161 = 0
-161 + 10x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '161' to each side of the equation.
-161 + 10x + 161 + x2 = 0 + 161

Reorder the terms:
-161 + 161 + 10x + x2 = 0 + 161

Combine like terms: -161 + 161 = 0
0 + 10x + x2 = 0 + 161
10x + x2 = 0 + 161

Combine like terms: 0 + 161 = 161
10x + x2 = 161

The x term is 10x.  Take half its coefficient (5).
Square it (25) and add it to both sides.

Add '25' to each side of the equation.
10x + 25 + x2 = 161 + 25

Reorder the terms:
25 + 10x + x2 = 161 + 25

Combine like terms: 161 + 25 = 186
25 + 10x + x2 = 186

Factor a perfect square on the left side:
(x + 5)(x + 5) = 186

Calculate the square root of the right side: 13.638181697

Break this problem into two subproblems by setting 
(x + 5) equal to 13.638181697 and -13.638181697.

Subproblem 1

x + 5 = 13.638181697 Simplifying x + 5 = 13.638181697 Reorder the terms: 5 + x = 13.638181697 Solving 5 + x = 13.638181697 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-5' to each side of the equation. 5 + -5 + x = 13.638181697 + -5 Combine like terms: 5 + -5 = 0 0 + x = 13.638181697 + -5 x = 13.638181697 + -5 Combine like terms: 13.638181697 + -5 = 8.638181697 x = 8.638181697 Simplifying x = 8.638181697

Subproblem 2

x + 5 = -13.638181697 Simplifying x + 5 = -13.638181697 Reorder the terms: 5 + x = -13.638181697 Solving 5 + x = -13.638181697 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-5' to each side of the equation. 5 + -5 + x = -13.638181697 + -5 Combine like terms: 5 + -5 = 0 0 + x = -13.638181697 + -5 x = -13.638181697 + -5 Combine like terms: -13.638181697 + -5 = -18.638181697 x = -18.638181697 Simplifying x = -18.638181697

Solution

The solution to the problem is based on the solutions from the subproblems. x = {8.638181697, -18.638181697}

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