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 for easier multiplication:
210 = x(2 + x) + 6
210 = (2 * x + x * x) + 6
210 = (2x + x2) + 6

Reorder the terms:
210 = 6 + 2x + x2

Solving
210 = 6 + 2x + x2

Solving for variable 'x'.

Combine like terms: 210 + -6 = 204
204 + -2x + -1x2 = 6 + 2x + x2 + -6 + -2x + -1x2

Reorder the terms:
204 + -2x + -1x2 = 6 + -6 + 2x + -2x + x2 + -1x2

Combine like terms: 6 + -6 = 0
204 + -2x + -1x2 = 0 + 2x + -2x + x2 + -1x2
204 + -2x + -1x2 = 2x + -2x + x2 + -1x2

Combine like terms: 2x + -2x = 0
204 + -2x + -1x2 = 0 + x2 + -1x2
204 + -2x + -1x2 = x2 + -1x2

Combine like terms: x2 + -1x2 = 0
204 + -2x + -1x2 = 0

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

Divide each side by '-1'.
-204 + 2x + x2 = 0

Move the constant term to the right:

Add '204' to each side of the equation.
-204 + 2x + 204 + x2 = 0 + 204

Reorder the terms:
-204 + 204 + 2x + x2 = 0 + 204

Combine like terms: -204 + 204 = 0
0 + 2x + x2 = 0 + 204
2x + x2 = 0 + 204

Combine like terms: 0 + 204 = 204
2x + x2 = 204

The x term is 2x.  Take half its coefficient (1).
Square it (1) and add it to both sides.

Add '1' to each side of the equation.
2x + 1 + x2 = 204 + 1

Reorder the terms:
1 + 2x + x2 = 204 + 1

Combine like terms: 204 + 1 = 205
1 + 2x + x2 = 205

Factor a perfect square on the left side:
(x + 1)(x + 1) = 205

Calculate the square root of the right side: 14.317821063

Break this problem into two subproblems by setting 
(x + 1) equal to 14.317821063 and -14.317821063.

Subproblem 1

x + 1 = 14.317821063 Simplifying x + 1 = 14.317821063 Reorder the terms: 1 + x = 14.317821063 Solving 1 + x = 14.317821063 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1' to each side of the equation. 1 + -1 + x = 14.317821063 + -1 Combine like terms: 1 + -1 = 0 0 + x = 14.317821063 + -1 x = 14.317821063 + -1 Combine like terms: 14.317821063 + -1 = 13.317821063 x = 13.317821063 Simplifying x = 13.317821063

Subproblem 2

x + 1 = -14.317821063 Simplifying x + 1 = -14.317821063 Reorder the terms: 1 + x = -14.317821063 Solving 1 + x = -14.317821063 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1' to each side of the equation. 1 + -1 + x = -14.317821063 + -1 Combine like terms: 1 + -1 = 0 0 + x = -14.317821063 + -1 x = -14.317821063 + -1 Combine like terms: -14.317821063 + -1 = -15.317821063 x = -15.317821063 Simplifying x = -15.317821063

Solution

The solution to the problem is based on the solutions from the subproblems. x = {13.317821063, -15.317821063}

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