210=(x+2)(x+6)

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Solution for 210=(x+2)(x+6) equation:


Simplifying
210 = (x + 2)(x + 6)

Reorder the terms:
210 = (2 + x)(x + 6)

Reorder the terms:
210 = (2 + x)(6 + x)

Multiply (2 + x) * (6 + x)
210 = (2(6 + x) + x(6 + x))
210 = ((6 * 2 + x * 2) + x(6 + x))
210 = ((12 + 2x) + x(6 + x))
210 = (12 + 2x + (6 * x + x * x))
210 = (12 + 2x + (6x + x2))

Combine like terms: 2x + 6x = 8x
210 = (12 + 8x + x2)

Solving
210 = 12 + 8x + x2

Solving for variable 'x'.

Combine like terms: 210 + -12 = 198
198 + -8x + -1x2 = 12 + 8x + x2 + -12 + -8x + -1x2

Reorder the terms:
198 + -8x + -1x2 = 12 + -12 + 8x + -8x + x2 + -1x2

Combine like terms: 12 + -12 = 0
198 + -8x + -1x2 = 0 + 8x + -8x + x2 + -1x2
198 + -8x + -1x2 = 8x + -8x + x2 + -1x2

Combine like terms: 8x + -8x = 0
198 + -8x + -1x2 = 0 + x2 + -1x2
198 + -8x + -1x2 = x2 + -1x2

Combine like terms: x2 + -1x2 = 0
198 + -8x + -1x2 = 0

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

Divide each side by '-1'.
-198 + 8x + x2 = 0

Move the constant term to the right:

Add '198' to each side of the equation.
-198 + 8x + 198 + x2 = 0 + 198

Reorder the terms:
-198 + 198 + 8x + x2 = 0 + 198

Combine like terms: -198 + 198 = 0
0 + 8x + x2 = 0 + 198
8x + x2 = 0 + 198

Combine like terms: 0 + 198 = 198
8x + x2 = 198

The x term is 8x.  Take half its coefficient (4).
Square it (16) and add it to both sides.

Add '16' to each side of the equation.
8x + 16 + x2 = 198 + 16

Reorder the terms:
16 + 8x + x2 = 198 + 16

Combine like terms: 198 + 16 = 214
16 + 8x + x2 = 214

Factor a perfect square on the left side:
(x + 4)(x + 4) = 214

Calculate the square root of the right side: 14.628738838

Break this problem into two subproblems by setting 
(x + 4) equal to 14.628738838 and -14.628738838.

Subproblem 1

x + 4 = 14.628738838 Simplifying x + 4 = 14.628738838 Reorder the terms: 4 + x = 14.628738838 Solving 4 + x = 14.628738838 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-4' to each side of the equation. 4 + -4 + x = 14.628738838 + -4 Combine like terms: 4 + -4 = 0 0 + x = 14.628738838 + -4 x = 14.628738838 + -4 Combine like terms: 14.628738838 + -4 = 10.628738838 x = 10.628738838 Simplifying x = 10.628738838

Subproblem 2

x + 4 = -14.628738838 Simplifying x + 4 = -14.628738838 Reorder the terms: 4 + x = -14.628738838 Solving 4 + x = -14.628738838 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-4' to each side of the equation. 4 + -4 + x = -14.628738838 + -4 Combine like terms: 4 + -4 = 0 0 + x = -14.628738838 + -4 x = -14.628738838 + -4 Combine like terms: -14.628738838 + -4 = -18.628738838 x = -18.628738838 Simplifying x = -18.628738838

Solution

The solution to the problem is based on the solutions from the subproblems. x = {10.628738838, -18.628738838}

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