x^2+14x=321

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Solution for x^2+14x=321 equation:


Simplifying
x2 + 14x = 321

Reorder the terms:
14x + x2 = 321

Solving
14x + x2 = 321

Solving for variable 'x'.

Reorder the terms:
-321 + 14x + x2 = 321 + -321

Combine like terms: 321 + -321 = 0
-321 + 14x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '321' to each side of the equation.
-321 + 14x + 321 + x2 = 0 + 321

Reorder the terms:
-321 + 321 + 14x + x2 = 0 + 321

Combine like terms: -321 + 321 = 0
0 + 14x + x2 = 0 + 321
14x + x2 = 0 + 321

Combine like terms: 0 + 321 = 321
14x + x2 = 321

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 = 321 + 49

Reorder the terms:
49 + 14x + x2 = 321 + 49

Combine like terms: 321 + 49 = 370
49 + 14x + x2 = 370

Factor a perfect square on the left side:
(x + 7)(x + 7) = 370

Calculate the square root of the right side: 19.235384062

Break this problem into two subproblems by setting 
(x + 7) equal to 19.235384062 and -19.235384062.

Subproblem 1

x + 7 = 19.235384062 Simplifying x + 7 = 19.235384062 Reorder the terms: 7 + x = 19.235384062 Solving 7 + x = 19.235384062 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 = 19.235384062 + -7 Combine like terms: 7 + -7 = 0 0 + x = 19.235384062 + -7 x = 19.235384062 + -7 Combine like terms: 19.235384062 + -7 = 12.235384062 x = 12.235384062 Simplifying x = 12.235384062

Subproblem 2

x + 7 = -19.235384062 Simplifying x + 7 = -19.235384062 Reorder the terms: 7 + x = -19.235384062 Solving 7 + x = -19.235384062 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 = -19.235384062 + -7 Combine like terms: 7 + -7 = 0 0 + x = -19.235384062 + -7 x = -19.235384062 + -7 Combine like terms: -19.235384062 + -7 = -26.235384062 x = -26.235384062 Simplifying x = -26.235384062

Solution

The solution to the problem is based on the solutions from the subproblems. x = {12.235384062, -26.235384062}

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