x^2+12=43-2x

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Solution for x^2+12=43-2x equation:


Simplifying
x2 + 12 = 43 + -2x

Reorder the terms:
12 + x2 = 43 + -2x

Solving
12 + x2 = 43 + -2x

Solving for variable 'x'.

Reorder the terms:
12 + -43 + 2x + x2 = 43 + -2x + -43 + 2x

Combine like terms: 12 + -43 = -31
-31 + 2x + x2 = 43 + -2x + -43 + 2x

Reorder the terms:
-31 + 2x + x2 = 43 + -43 + -2x + 2x

Combine like terms: 43 + -43 = 0
-31 + 2x + x2 = 0 + -2x + 2x
-31 + 2x + x2 = -2x + 2x

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

Begin completing the square.

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 = 4.656854249 x = 4.656854249 Simplifying x = 4.656854249

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 = -6.656854249 x = -6.656854249 Simplifying x = -6.656854249

Solution

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

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