x^2+6x=388

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Solution for x^2+6x=388 equation:


Simplifying
x2 + 6x = 388

Reorder the terms:
6x + x2 = 388

Solving
6x + x2 = 388

Solving for variable 'x'.

Reorder the terms:
-388 + 6x + x2 = 388 + -388

Combine like terms: 388 + -388 = 0
-388 + 6x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '388' to each side of the equation.
-388 + 6x + 388 + x2 = 0 + 388

Reorder the terms:
-388 + 388 + 6x + x2 = 0 + 388

Combine like terms: -388 + 388 = 0
0 + 6x + x2 = 0 + 388
6x + x2 = 0 + 388

Combine like terms: 0 + 388 = 388
6x + x2 = 388

The x term is 6x.  Take half its coefficient (3).
Square it (9) and add it to both sides.

Add '9' to each side of the equation.
6x + 9 + x2 = 388 + 9

Reorder the terms:
9 + 6x + x2 = 388 + 9

Combine like terms: 388 + 9 = 397
9 + 6x + x2 = 397

Factor a perfect square on the left side:
(x + 3)(x + 3) = 397

Calculate the square root of the right side: 19.924858845

Break this problem into two subproblems by setting 
(x + 3) equal to 19.924858845 and -19.924858845.

Subproblem 1

x + 3 = 19.924858845 Simplifying x + 3 = 19.924858845 Reorder the terms: 3 + x = 19.924858845 Solving 3 + x = 19.924858845 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-3' to each side of the equation. 3 + -3 + x = 19.924858845 + -3 Combine like terms: 3 + -3 = 0 0 + x = 19.924858845 + -3 x = 19.924858845 + -3 Combine like terms: 19.924858845 + -3 = 16.924858845 x = 16.924858845 Simplifying x = 16.924858845

Subproblem 2

x + 3 = -19.924858845 Simplifying x + 3 = -19.924858845 Reorder the terms: 3 + x = -19.924858845 Solving 3 + x = -19.924858845 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-3' to each side of the equation. 3 + -3 + x = -19.924858845 + -3 Combine like terms: 3 + -3 = 0 0 + x = -19.924858845 + -3 x = -19.924858845 + -3 Combine like terms: -19.924858845 + -3 = -22.924858845 x = -22.924858845 Simplifying x = -22.924858845

Solution

The solution to the problem is based on the solutions from the subproblems. x = {16.924858845, -22.924858845}

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