(2x+23)=(x^2-8)

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Solution for (2x+23)=(x^2-8) equation:


Simplifying
(2x + 23) = (x2 + -8)

Reorder the terms:
(23 + 2x) = (x2 + -8)

Remove parenthesis around (23 + 2x)
23 + 2x = (x2 + -8)

Reorder the terms:
23 + 2x = (-8 + x2)

Remove parenthesis around (-8 + x2)
23 + 2x = -8 + x2

Solving
23 + 2x = -8 + x2

Solving for variable 'x'.

Reorder the terms:
23 + 8 + 2x + -1x2 = -8 + x2 + 8 + -1x2

Combine like terms: 23 + 8 = 31
31 + 2x + -1x2 = -8 + x2 + 8 + -1x2

Reorder the terms:
31 + 2x + -1x2 = -8 + 8 + x2 + -1x2

Combine like terms: -8 + 8 = 0
31 + 2x + -1x2 = 0 + x2 + -1x2
31 + 2x + -1x2 = x2 + -1x2

Combine like terms: x2 + -1x2 = 0
31 + 2x + -1x2 = 0

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

Divide each side by '-1'.
-31 + -2x + x2 = 0

Move the constant term to the right:

Add '31' to each side of the equation.
-31 + -2x + 31 + x2 = 0 + 31

Reorder the terms:
-31 + 31 + -2x + x2 = 0 + 31

Combine like terms: -31 + 31 = 0
0 + -2x + x2 = 0 + 31
-2x + x2 = 0 + 31

Combine like terms: 0 + 31 = 31
-2x + x2 = 31

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 = 31 + 1

Reorder the terms:
1 + -2x + x2 = 31 + 1

Combine like terms: 31 + 1 = 32
1 + -2x + x2 = 32

Factor a perfect square on the left side:
(x + -1)(x + -1) = 32

Calculate the square root of the right side: 5.656854249

Break this problem into two subproblems by setting 
(x + -1) equal to 5.656854249 and -5.656854249.

Subproblem 1

x + -1 = 5.656854249 Simplifying x + -1 = 5.656854249 Reorder the terms: -1 + x = 5.656854249 Solving -1 + x = 5.656854249 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 = 5.656854249 + 1 Combine like terms: -1 + 1 = 0 0 + x = 5.656854249 + 1 x = 5.656854249 + 1 Combine like terms: 5.656854249 + 1 = 6.656854249 x = 6.656854249 Simplifying x = 6.656854249

Subproblem 2

x + -1 = -5.656854249 Simplifying x + -1 = -5.656854249 Reorder the terms: -1 + x = -5.656854249 Solving -1 + x = -5.656854249 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 = -5.656854249 + 1 Combine like terms: -1 + 1 = 0 0 + x = -5.656854249 + 1 x = -5.656854249 + 1 Combine like terms: -5.656854249 + 1 = -4.656854249 x = -4.656854249 Simplifying x = -4.656854249

Solution

The solution to the problem is based on the solutions from the subproblems. x = {6.656854249, -4.656854249}

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