12x+x^2=225

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Solution for 12x+x^2=225 equation:


Simplifying
12x + x2 = 225

Solving
12x + x2 = 225

Solving for variable 'x'.

Reorder the terms:
-225 + 12x + x2 = 225 + -225

Combine like terms: 225 + -225 = 0
-225 + 12x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '225' to each side of the equation.
-225 + 12x + 225 + x2 = 0 + 225

Reorder the terms:
-225 + 225 + 12x + x2 = 0 + 225

Combine like terms: -225 + 225 = 0
0 + 12x + x2 = 0 + 225
12x + x2 = 0 + 225

Combine like terms: 0 + 225 = 225
12x + x2 = 225

The x term is 12x.  Take half its coefficient (6).
Square it (36) and add it to both sides.

Add '36' to each side of the equation.
12x + 36 + x2 = 225 + 36

Reorder the terms:
36 + 12x + x2 = 225 + 36

Combine like terms: 225 + 36 = 261
36 + 12x + x2 = 261

Factor a perfect square on the left side:
(x + 6)(x + 6) = 261

Calculate the square root of the right side: 16.155494421

Break this problem into two subproblems by setting 
(x + 6) equal to 16.155494421 and -16.155494421.

Subproblem 1

x + 6 = 16.155494421 Simplifying x + 6 = 16.155494421 Reorder the terms: 6 + x = 16.155494421 Solving 6 + x = 16.155494421 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-6' to each side of the equation. 6 + -6 + x = 16.155494421 + -6 Combine like terms: 6 + -6 = 0 0 + x = 16.155494421 + -6 x = 16.155494421 + -6 Combine like terms: 16.155494421 + -6 = 10.155494421 x = 10.155494421 Simplifying x = 10.155494421

Subproblem 2

x + 6 = -16.155494421 Simplifying x + 6 = -16.155494421 Reorder the terms: 6 + x = -16.155494421 Solving 6 + x = -16.155494421 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-6' to each side of the equation. 6 + -6 + x = -16.155494421 + -6 Combine like terms: 6 + -6 = 0 0 + x = -16.155494421 + -6 x = -16.155494421 + -6 Combine like terms: -16.155494421 + -6 = -22.155494421 x = -22.155494421 Simplifying x = -22.155494421

Solution

The solution to the problem is based on the solutions from the subproblems. x = {10.155494421, -22.155494421}

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