225=x(14+x)

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Solution for 225=x(14+x) equation:


Simplifying
225 = x(14 + x)
225 = (14 * x + x * x)
225 = (14x + x2)

Solving
225 = 14x + x2

Solving for variable 'x'.

Reorder the terms:
225 + -14x + -1x2 = 14x + -14x + x2 + -1x2

Combine like terms: 14x + -14x = 0
225 + -14x + -1x2 = 0 + x2 + -1x2
225 + -14x + -1x2 = x2 + -1x2

Combine like terms: x2 + -1x2 = 0
225 + -14x + -1x2 = 0

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

Divide each side by '-1'.
-225 + 14x + x2 = 0

Move the constant term to the right:

Add '225' to each side of the equation.
-225 + 14x + 225 + x2 = 0 + 225

Reorder the terms:
-225 + 225 + 14x + x2 = 0 + 225

Combine like terms: -225 + 225 = 0
0 + 14x + x2 = 0 + 225
14x + x2 = 0 + 225

Combine like terms: 0 + 225 = 225
14x + x2 = 225

The x term is 14x.  Take half its coefficient (7).
Square it (49) and add it to both sides.

Add '49' to each side of the equation.
14x + 49 + x2 = 225 + 49

Reorder the terms:
49 + 14x + x2 = 225 + 49

Combine like terms: 225 + 49 = 274
49 + 14x + x2 = 274

Factor a perfect square on the left side:
(x + 7)(x + 7) = 274

Calculate the square root of the right side: 16.552945357

Break this problem into two subproblems by setting 
(x + 7) equal to 16.552945357 and -16.552945357.

Subproblem 1

x + 7 = 16.552945357 Simplifying x + 7 = 16.552945357 Reorder the terms: 7 + x = 16.552945357 Solving 7 + x = 16.552945357 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-7' to each side of the equation. 7 + -7 + x = 16.552945357 + -7 Combine like terms: 7 + -7 = 0 0 + x = 16.552945357 + -7 x = 16.552945357 + -7 Combine like terms: 16.552945357 + -7 = 9.552945357 x = 9.552945357 Simplifying x = 9.552945357

Subproblem 2

x + 7 = -16.552945357 Simplifying x + 7 = -16.552945357 Reorder the terms: 7 + x = -16.552945357 Solving 7 + x = -16.552945357 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-7' to each side of the equation. 7 + -7 + x = -16.552945357 + -7 Combine like terms: 7 + -7 = 0 0 + x = -16.552945357 + -7 x = -16.552945357 + -7 Combine like terms: -16.552945357 + -7 = -23.552945357 x = -23.552945357 Simplifying x = -23.552945357

Solution

The solution to the problem is based on the solutions from the subproblems. x = {9.552945357, -23.552945357}

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