x*x+6x=558

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Solution for x*x+6x=558 equation:


Simplifying
x * x + 6x = 558

Multiply x * x
x2 + 6x = 558

Reorder the terms:
6x + x2 = 558

Solving
6x + x2 = 558

Solving for variable 'x'.

Reorder the terms:
-558 + 6x + x2 = 558 + -558

Combine like terms: 558 + -558 = 0
-558 + 6x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '558' to each side of the equation.
-558 + 6x + 558 + x2 = 0 + 558

Reorder the terms:
-558 + 558 + 6x + x2 = 0 + 558

Combine like terms: -558 + 558 = 0
0 + 6x + x2 = 0 + 558
6x + x2 = 0 + 558

Combine like terms: 0 + 558 = 558
6x + x2 = 558

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 = 558 + 9

Reorder the terms:
9 + 6x + x2 = 558 + 9

Combine like terms: 558 + 9 = 567
9 + 6x + x2 = 567

Factor a perfect square on the left side:
(x + 3)(x + 3) = 567

Calculate the square root of the right side: 23.8117618

Break this problem into two subproblems by setting 
(x + 3) equal to 23.8117618 and -23.8117618.

Subproblem 1

x + 3 = 23.8117618 Simplifying x + 3 = 23.8117618 Reorder the terms: 3 + x = 23.8117618 Solving 3 + x = 23.8117618 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 = 23.8117618 + -3 Combine like terms: 3 + -3 = 0 0 + x = 23.8117618 + -3 x = 23.8117618 + -3 Combine like terms: 23.8117618 + -3 = 20.8117618 x = 20.8117618 Simplifying x = 20.8117618

Subproblem 2

x + 3 = -23.8117618 Simplifying x + 3 = -23.8117618 Reorder the terms: 3 + x = -23.8117618 Solving 3 + x = -23.8117618 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 = -23.8117618 + -3 Combine like terms: 3 + -3 = 0 0 + x = -23.8117618 + -3 x = -23.8117618 + -3 Combine like terms: -23.8117618 + -3 = -26.8117618 x = -26.8117618 Simplifying x = -26.8117618

Solution

The solution to the problem is based on the solutions from the subproblems. x = {20.8117618, -26.8117618}

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