x^2-4x-12=16

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Solution for x^2-4x-12=16 equation:


Simplifying
x2 + -4x + -12 = 16

Reorder the terms:
-12 + -4x + x2 = 16

Solving
-12 + -4x + x2 = 16

Solving for variable 'x'.

Reorder the terms:
-12 + -16 + -4x + x2 = 16 + -16

Combine like terms: -12 + -16 = -28
-28 + -4x + x2 = 16 + -16

Combine like terms: 16 + -16 = 0
-28 + -4x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '28' to each side of the equation.
-28 + -4x + 28 + x2 = 0 + 28

Reorder the terms:
-28 + 28 + -4x + x2 = 0 + 28

Combine like terms: -28 + 28 = 0
0 + -4x + x2 = 0 + 28
-4x + x2 = 0 + 28

Combine like terms: 0 + 28 = 28
-4x + x2 = 28

The x term is -4x.  Take half its coefficient (-2).
Square it (4) and add it to both sides.

Add '4' to each side of the equation.
-4x + 4 + x2 = 28 + 4

Reorder the terms:
4 + -4x + x2 = 28 + 4

Combine like terms: 28 + 4 = 32
4 + -4x + x2 = 32

Factor a perfect square on the left side:
(x + -2)(x + -2) = 32

Calculate the square root of the right side: 5.656854249

Break this problem into two subproblems by setting 
(x + -2) equal to 5.656854249 and -5.656854249.

Subproblem 1

x + -2 = 5.656854249 Simplifying x + -2 = 5.656854249 Reorder the terms: -2 + x = 5.656854249 Solving -2 + x = 5.656854249 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '2' to each side of the equation. -2 + 2 + x = 5.656854249 + 2 Combine like terms: -2 + 2 = 0 0 + x = 5.656854249 + 2 x = 5.656854249 + 2 Combine like terms: 5.656854249 + 2 = 7.656854249 x = 7.656854249 Simplifying x = 7.656854249

Subproblem 2

x + -2 = -5.656854249 Simplifying x + -2 = -5.656854249 Reorder the terms: -2 + x = -5.656854249 Solving -2 + x = -5.656854249 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '2' to each side of the equation. -2 + 2 + x = -5.656854249 + 2 Combine like terms: -2 + 2 = 0 0 + x = -5.656854249 + 2 x = -5.656854249 + 2 Combine like terms: -5.656854249 + 2 = -3.656854249 x = -3.656854249 Simplifying x = -3.656854249

Solution

The solution to the problem is based on the solutions from the subproblems. x = {7.656854249, -3.656854249}

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