166=7x(x+6)

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Solution for 166=7x(x+6) equation:


Simplifying
166 = 7x(x + 6)

Reorder the terms:
166 = 7x(6 + x)
166 = (6 * 7x + x * 7x)
166 = (42x + 7x2)

Solving
166 = 42x + 7x2

Solving for variable 'x'.

Reorder the terms:
166 + -42x + -7x2 = 42x + -42x + 7x2 + -7x2

Combine like terms: 42x + -42x = 0
166 + -42x + -7x2 = 0 + 7x2 + -7x2
166 + -42x + -7x2 = 7x2 + -7x2

Combine like terms: 7x2 + -7x2 = 0
166 + -42x + -7x2 = 0

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

Divide each side by '-7'.
-23.71428571 + 6x + x2 = 0

Move the constant term to the right:

Add '23.71428571' to each side of the equation.
-23.71428571 + 6x + 23.71428571 + x2 = 0 + 23.71428571

Reorder the terms:
-23.71428571 + 23.71428571 + 6x + x2 = 0 + 23.71428571

Combine like terms: -23.71428571 + 23.71428571 = 0.00000000
0.00000000 + 6x + x2 = 0 + 23.71428571
6x + x2 = 0 + 23.71428571

Combine like terms: 0 + 23.71428571 = 23.71428571
6x + x2 = 23.71428571

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 = 23.71428571 + 9

Reorder the terms:
9 + 6x + x2 = 23.71428571 + 9

Combine like terms: 23.71428571 + 9 = 32.71428571
9 + 6x + x2 = 32.71428571

Factor a perfect square on the left side:
(x + 3)(x + 3) = 32.71428571

Calculate the square root of the right side: 5.719640348

Break this problem into two subproblems by setting 
(x + 3) equal to 5.719640348 and -5.719640348.

Subproblem 1

x + 3 = 5.719640348 Simplifying x + 3 = 5.719640348 Reorder the terms: 3 + x = 5.719640348 Solving 3 + x = 5.719640348 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 = 5.719640348 + -3 Combine like terms: 3 + -3 = 0 0 + x = 5.719640348 + -3 x = 5.719640348 + -3 Combine like terms: 5.719640348 + -3 = 2.719640348 x = 2.719640348 Simplifying x = 2.719640348

Subproblem 2

x + 3 = -5.719640348 Simplifying x + 3 = -5.719640348 Reorder the terms: 3 + x = -5.719640348 Solving 3 + x = -5.719640348 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 = -5.719640348 + -3 Combine like terms: 3 + -3 = 0 0 + x = -5.719640348 + -3 x = -5.719640348 + -3 Combine like terms: -5.719640348 + -3 = -8.719640348 x = -8.719640348 Simplifying x = -8.719640348

Solution

The solution to the problem is based on the solutions from the subproblems. x = {2.719640348, -8.719640348}

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