x^2+6x+9=23

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Solution for x^2+6x+9=23 equation:


Simplifying
x2 + 6x + 9 = 23

Reorder the terms:
9 + 6x + x2 = 23

Solving
9 + 6x + x2 = 23

Solving for variable 'x'.

Reorder the terms:
9 + -23 + 6x + x2 = 23 + -23

Combine like terms: 9 + -23 = -14
-14 + 6x + x2 = 23 + -23

Combine like terms: 23 + -23 = 0
-14 + 6x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '14' to each side of the equation.
-14 + 6x + 14 + x2 = 0 + 14

Reorder the terms:
-14 + 14 + 6x + x2 = 0 + 14

Combine like terms: -14 + 14 = 0
0 + 6x + x2 = 0 + 14
6x + x2 = 0 + 14

Combine like terms: 0 + 14 = 14
6x + x2 = 14

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 = 14 + 9

Reorder the terms:
9 + 6x + x2 = 14 + 9

Combine like terms: 14 + 9 = 23
9 + 6x + x2 = 23

Factor a perfect square on the left side:
(x + 3)(x + 3) = 23

Calculate the square root of the right side: 4.795831523

Break this problem into two subproblems by setting 
(x + 3) equal to 4.795831523 and -4.795831523.

Subproblem 1

x + 3 = 4.795831523 Simplifying x + 3 = 4.795831523 Reorder the terms: 3 + x = 4.795831523 Solving 3 + x = 4.795831523 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 = 4.795831523 + -3 Combine like terms: 3 + -3 = 0 0 + x = 4.795831523 + -3 x = 4.795831523 + -3 Combine like terms: 4.795831523 + -3 = 1.795831523 x = 1.795831523 Simplifying x = 1.795831523

Subproblem 2

x + 3 = -4.795831523 Simplifying x + 3 = -4.795831523 Reorder the terms: 3 + x = -4.795831523 Solving 3 + x = -4.795831523 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 = -4.795831523 + -3 Combine like terms: 3 + -3 = 0 0 + x = -4.795831523 + -3 x = -4.795831523 + -3 Combine like terms: -4.795831523 + -3 = -7.795831523 x = -7.795831523 Simplifying x = -7.795831523

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.795831523, -7.795831523}

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