180=(10+x)(x)

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Solution for 180=(10+x)(x) equation:


Simplifying
180 = (10 + x)(x)

Reorder the terms for easier multiplication:
180 = x(10 + x)
180 = (10 * x + x * x)
180 = (10x + x2)

Solving
180 = 10x + x2

Solving for variable 'x'.

Reorder the terms:
180 + -10x + -1x2 = 10x + -10x + x2 + -1x2

Combine like terms: 10x + -10x = 0
180 + -10x + -1x2 = 0 + x2 + -1x2
180 + -10x + -1x2 = x2 + -1x2

Combine like terms: x2 + -1x2 = 0
180 + -10x + -1x2 = 0

Begin completing the square.  Divide all terms by
-1 the coefficient of the squared term: 

Divide each side by '-1'.
-180 + 10x + x2 = 0

Move the constant term to the right:

Add '180' to each side of the equation.
-180 + 10x + 180 + x2 = 0 + 180

Reorder the terms:
-180 + 180 + 10x + x2 = 0 + 180

Combine like terms: -180 + 180 = 0
0 + 10x + x2 = 0 + 180
10x + x2 = 0 + 180

Combine like terms: 0 + 180 = 180
10x + x2 = 180

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 = 180 + 25

Reorder the terms:
25 + 10x + x2 = 180 + 25

Combine like terms: 180 + 25 = 205
25 + 10x + x2 = 205

Factor a perfect square on the left side:
(x + 5)(x + 5) = 205

Calculate the square root of the right side: 14.317821063

Break this problem into two subproblems by setting 
(x + 5) equal to 14.317821063 and -14.317821063.

Subproblem 1

x + 5 = 14.317821063 Simplifying x + 5 = 14.317821063 Reorder the terms: 5 + x = 14.317821063 Solving 5 + x = 14.317821063 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 = 14.317821063 + -5 Combine like terms: 5 + -5 = 0 0 + x = 14.317821063 + -5 x = 14.317821063 + -5 Combine like terms: 14.317821063 + -5 = 9.317821063 x = 9.317821063 Simplifying x = 9.317821063

Subproblem 2

x + 5 = -14.317821063 Simplifying x + 5 = -14.317821063 Reorder the terms: 5 + x = -14.317821063 Solving 5 + x = -14.317821063 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 = -14.317821063 + -5 Combine like terms: 5 + -5 = 0 0 + x = -14.317821063 + -5 x = -14.317821063 + -5 Combine like terms: -14.317821063 + -5 = -19.317821063 x = -19.317821063 Simplifying x = -19.317821063

Solution

The solution to the problem is based on the solutions from the subproblems. x = {9.317821063, -19.317821063}

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