336=x^2+6x

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Solution for 336=x^2+6x equation:


Simplifying
336 = x2 + 6x

Reorder the terms:
336 = 6x + x2

Solving
336 = 6x + x2

Solving for variable 'x'.

Reorder the terms:
336 + -6x + -1x2 = 6x + -6x + x2 + -1x2

Combine like terms: 6x + -6x = 0
336 + -6x + -1x2 = 0 + x2 + -1x2
336 + -6x + -1x2 = x2 + -1x2

Combine like terms: x2 + -1x2 = 0
336 + -6x + -1x2 = 0

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

Divide each side by '-1'.
-336 + 6x + x2 = 0

Move the constant term to the right:

Add '336' to each side of the equation.
-336 + 6x + 336 + x2 = 0 + 336

Reorder the terms:
-336 + 336 + 6x + x2 = 0 + 336

Combine like terms: -336 + 336 = 0
0 + 6x + x2 = 0 + 336
6x + x2 = 0 + 336

Combine like terms: 0 + 336 = 336
6x + x2 = 336

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 = 336 + 9

Reorder the terms:
9 + 6x + x2 = 336 + 9

Combine like terms: 336 + 9 = 345
9 + 6x + x2 = 345

Factor a perfect square on the left side:
(x + 3)(x + 3) = 345

Calculate the square root of the right side: 18.574175621

Break this problem into two subproblems by setting 
(x + 3) equal to 18.574175621 and -18.574175621.

Subproblem 1

x + 3 = 18.574175621 Simplifying x + 3 = 18.574175621 Reorder the terms: 3 + x = 18.574175621 Solving 3 + x = 18.574175621 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 = 18.574175621 + -3 Combine like terms: 3 + -3 = 0 0 + x = 18.574175621 + -3 x = 18.574175621 + -3 Combine like terms: 18.574175621 + -3 = 15.574175621 x = 15.574175621 Simplifying x = 15.574175621

Subproblem 2

x + 3 = -18.574175621 Simplifying x + 3 = -18.574175621 Reorder the terms: 3 + x = -18.574175621 Solving 3 + x = -18.574175621 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 = -18.574175621 + -3 Combine like terms: 3 + -3 = 0 0 + x = -18.574175621 + -3 x = -18.574175621 + -3 Combine like terms: -18.574175621 + -3 = -21.574175621 x = -21.574175621 Simplifying x = -21.574175621

Solution

The solution to the problem is based on the solutions from the subproblems. x = {15.574175621, -21.574175621}

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