2x^2-x-38=0

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


Simplifying
2x2 + -1x + -38 = 0

Reorder the terms:
-38 + -1x + 2x2 = 0

Solving
-38 + -1x + 2x2 = 0

Solving for variable 'x'.

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

Divide each side by '2'.
-19 + -0.5x + x2 = 0

Move the constant term to the right:

Add '19' to each side of the equation.
-19 + -0.5x + 19 + x2 = 0 + 19

Reorder the terms:
-19 + 19 + -0.5x + x2 = 0 + 19

Combine like terms: -19 + 19 = 0
0 + -0.5x + x2 = 0 + 19
-0.5x + x2 = 0 + 19

Combine like terms: 0 + 19 = 19
-0.5x + x2 = 19

The x term is -0.5x.  Take half its coefficient (-0.25).
Square it (0.0625) and add it to both sides.

Add '0.0625' to each side of the equation.
-0.5x + 0.0625 + x2 = 19 + 0.0625

Reorder the terms:
0.0625 + -0.5x + x2 = 19 + 0.0625

Combine like terms: 19 + 0.0625 = 19.0625
0.0625 + -0.5x + x2 = 19.0625

Factor a perfect square on the left side:
(x + -0.25)(x + -0.25) = 19.0625

Calculate the square root of the right side: 4.366062299

Break this problem into two subproblems by setting 
(x + -0.25) equal to 4.366062299 and -4.366062299.

Subproblem 1

x + -0.25 = 4.366062299 Simplifying x + -0.25 = 4.366062299 Reorder the terms: -0.25 + x = 4.366062299 Solving -0.25 + x = 4.366062299 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.25' to each side of the equation. -0.25 + 0.25 + x = 4.366062299 + 0.25 Combine like terms: -0.25 + 0.25 = 0.00 0.00 + x = 4.366062299 + 0.25 x = 4.366062299 + 0.25 Combine like terms: 4.366062299 + 0.25 = 4.616062299 x = 4.616062299 Simplifying x = 4.616062299

Subproblem 2

x + -0.25 = -4.366062299 Simplifying x + -0.25 = -4.366062299 Reorder the terms: -0.25 + x = -4.366062299 Solving -0.25 + x = -4.366062299 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.25' to each side of the equation. -0.25 + 0.25 + x = -4.366062299 + 0.25 Combine like terms: -0.25 + 0.25 = 0.00 0.00 + x = -4.366062299 + 0.25 x = -4.366062299 + 0.25 Combine like terms: -4.366062299 + 0.25 = -4.116062299 x = -4.116062299 Simplifying x = -4.116062299

Solution

The solution to the problem is based on the solutions from the subproblems. x = {4.616062299, -4.116062299}

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