x^2-4x-38=0

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Solution for x^2-4x-38=0 equation:


Simplifying
x2 + -4x + -38 = 0

Reorder the terms:
-38 + -4x + x2 = 0

Solving
-38 + -4x + x2 = 0

Solving for variable 'x'.

Begin completing the square.

Move the constant term to the right:

Add '38' to each side of the equation.
-38 + -4x + 38 + x2 = 0 + 38

Reorder the terms:
-38 + 38 + -4x + x2 = 0 + 38

Combine like terms: -38 + 38 = 0
0 + -4x + x2 = 0 + 38
-4x + x2 = 0 + 38

Combine like terms: 0 + 38 = 38
-4x + x2 = 38

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 = 38 + 4

Reorder the terms:
4 + -4x + x2 = 38 + 4

Combine like terms: 38 + 4 = 42
4 + -4x + x2 = 42

Factor a perfect square on the left side:
(x + -2)(x + -2) = 42

Calculate the square root of the right side: 6.480740698

Break this problem into two subproblems by setting 
(x + -2) equal to 6.480740698 and -6.480740698.

Subproblem 1

x + -2 = 6.480740698 Simplifying x + -2 = 6.480740698 Reorder the terms: -2 + x = 6.480740698 Solving -2 + x = 6.480740698 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 = 6.480740698 + 2 Combine like terms: -2 + 2 = 0 0 + x = 6.480740698 + 2 x = 6.480740698 + 2 Combine like terms: 6.480740698 + 2 = 8.480740698 x = 8.480740698 Simplifying x = 8.480740698

Subproblem 2

x + -2 = -6.480740698 Simplifying x + -2 = -6.480740698 Reorder the terms: -2 + x = -6.480740698 Solving -2 + x = -6.480740698 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 = -6.480740698 + 2 Combine like terms: -2 + 2 = 0 0 + x = -6.480740698 + 2 x = -6.480740698 + 2 Combine like terms: -6.480740698 + 2 = -4.480740698 x = -4.480740698 Simplifying x = -4.480740698

Solution

The solution to the problem is based on the solutions from the subproblems. x = {8.480740698, -4.480740698}

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