6x(x+7)=6x-7

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Solution for 6x(x+7)=6x-7 equation:


Simplifying
6x(x + 7) = 6x + -7

Reorder the terms:
6x(7 + x) = 6x + -7
(7 * 6x + x * 6x) = 6x + -7
(42x + 6x2) = 6x + -7

Reorder the terms:
42x + 6x2 = -7 + 6x

Solving
42x + 6x2 = -7 + 6x

Solving for variable 'x'.

Reorder the terms:
7 + 42x + -6x + 6x2 = -7 + 6x + 7 + -6x

Combine like terms: 42x + -6x = 36x
7 + 36x + 6x2 = -7 + 6x + 7 + -6x

Reorder the terms:
7 + 36x + 6x2 = -7 + 7 + 6x + -6x

Combine like terms: -7 + 7 = 0
7 + 36x + 6x2 = 0 + 6x + -6x
7 + 36x + 6x2 = 6x + -6x

Combine like terms: 6x + -6x = 0
7 + 36x + 6x2 = 0

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

Divide each side by '6'.
1.166666667 + 6x + x2 = 0

Move the constant term to the right:

Add '-1.166666667' to each side of the equation.
1.166666667 + 6x + -1.166666667 + x2 = 0 + -1.166666667

Reorder the terms:
1.166666667 + -1.166666667 + 6x + x2 = 0 + -1.166666667

Combine like terms: 1.166666667 + -1.166666667 = 0.000000000
0.000000000 + 6x + x2 = 0 + -1.166666667
6x + x2 = 0 + -1.166666667

Combine like terms: 0 + -1.166666667 = -1.166666667
6x + x2 = -1.166666667

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 = -1.166666667 + 9

Reorder the terms:
9 + 6x + x2 = -1.166666667 + 9

Combine like terms: -1.166666667 + 9 = 7.833333333
9 + 6x + x2 = 7.833333333

Factor a perfect square on the left side:
(x + 3)(x + 3) = 7.833333333

Calculate the square root of the right side: 2.798809271

Break this problem into two subproblems by setting 
(x + 3) equal to 2.798809271 and -2.798809271.

Subproblem 1

x + 3 = 2.798809271 Simplifying x + 3 = 2.798809271 Reorder the terms: 3 + x = 2.798809271 Solving 3 + x = 2.798809271 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 = 2.798809271 + -3 Combine like terms: 3 + -3 = 0 0 + x = 2.798809271 + -3 x = 2.798809271 + -3 Combine like terms: 2.798809271 + -3 = -0.201190729 x = -0.201190729 Simplifying x = -0.201190729

Subproblem 2

x + 3 = -2.798809271 Simplifying x + 3 = -2.798809271 Reorder the terms: 3 + x = -2.798809271 Solving 3 + x = -2.798809271 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 = -2.798809271 + -3 Combine like terms: 3 + -3 = 0 0 + x = -2.798809271 + -3 x = -2.798809271 + -3 Combine like terms: -2.798809271 + -3 = -5.798809271 x = -5.798809271 Simplifying x = -5.798809271

Solution

The solution to the problem is based on the solutions from the subproblems. x = {-0.201190729, -5.798809271}

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