7x(x+6)=6

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


Simplifying
7x(x + 6) = 6

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

Solving
42x + 7x2 = 6

Solving for variable 'x'.

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

Combine like terms: 6 + -6 = 0
-6 + 42x + 7x2 = 0

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

Divide each side by '7'.
-0.8571428571 + 6x + x2 = 0

Move the constant term to the right:

Add '0.8571428571' to each side of the equation.
-0.8571428571 + 6x + 0.8571428571 + x2 = 0 + 0.8571428571

Reorder the terms:
-0.8571428571 + 0.8571428571 + 6x + x2 = 0 + 0.8571428571

Combine like terms: -0.8571428571 + 0.8571428571 = 0.0000000000
0.0000000000 + 6x + x2 = 0 + 0.8571428571
6x + x2 = 0 + 0.8571428571

Combine like terms: 0 + 0.8571428571 = 0.8571428571
6x + x2 = 0.8571428571

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 = 0.8571428571 + 9

Reorder the terms:
9 + 6x + x2 = 0.8571428571 + 9

Combine like terms: 0.8571428571 + 9 = 9.8571428571
9 + 6x + x2 = 9.8571428571

Factor a perfect square on the left side:
(x + 3)(x + 3) = 9.8571428571

Calculate the square root of the right side: 3.139608711

Break this problem into two subproblems by setting 
(x + 3) equal to 3.139608711 and -3.139608711.

Subproblem 1

x + 3 = 3.139608711 Simplifying x + 3 = 3.139608711 Reorder the terms: 3 + x = 3.139608711 Solving 3 + x = 3.139608711 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 = 3.139608711 + -3 Combine like terms: 3 + -3 = 0 0 + x = 3.139608711 + -3 x = 3.139608711 + -3 Combine like terms: 3.139608711 + -3 = 0.139608711 x = 0.139608711 Simplifying x = 0.139608711

Subproblem 2

x + 3 = -3.139608711 Simplifying x + 3 = -3.139608711 Reorder the terms: 3 + x = -3.139608711 Solving 3 + x = -3.139608711 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 = -3.139608711 + -3 Combine like terms: 3 + -3 = 0 0 + x = -3.139608711 + -3 x = -3.139608711 + -3 Combine like terms: -3.139608711 + -3 = -6.139608711 x = -6.139608711 Simplifying x = -6.139608711

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.139608711, -6.139608711}

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