8x^2-35x-38=0

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Solution for 8x^2-35x-38=0 equation:


Simplifying
8x2 + -35x + -38 = 0

Reorder the terms:
-38 + -35x + 8x2 = 0

Solving
-38 + -35x + 8x2 = 0

Solving for variable 'x'.

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

Divide each side by '8'.
-4.75 + -4.375x + x2 = 0

Move the constant term to the right:

Add '4.75' to each side of the equation.
-4.75 + -4.375x + 4.75 + x2 = 0 + 4.75

Reorder the terms:
-4.75 + 4.75 + -4.375x + x2 = 0 + 4.75

Combine like terms: -4.75 + 4.75 = 0.00
0.00 + -4.375x + x2 = 0 + 4.75
-4.375x + x2 = 0 + 4.75

Combine like terms: 0 + 4.75 = 4.75
-4.375x + x2 = 4.75

The x term is -4.375x.  Take half its coefficient (-2.1875).
Square it (4.78515625) and add it to both sides.

Add '4.78515625' to each side of the equation.
-4.375x + 4.78515625 + x2 = 4.75 + 4.78515625

Reorder the terms:
4.78515625 + -4.375x + x2 = 4.75 + 4.78515625

Combine like terms: 4.75 + 4.78515625 = 9.53515625
4.78515625 + -4.375x + x2 = 9.53515625

Factor a perfect square on the left side:
(x + -2.1875)(x + -2.1875) = 9.53515625

Calculate the square root of the right side: 3.087904832

Break this problem into two subproblems by setting 
(x + -2.1875) equal to 3.087904832 and -3.087904832.

Subproblem 1

x + -2.1875 = 3.087904832 Simplifying x + -2.1875 = 3.087904832 Reorder the terms: -2.1875 + x = 3.087904832 Solving -2.1875 + x = 3.087904832 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '2.1875' to each side of the equation. -2.1875 + 2.1875 + x = 3.087904832 + 2.1875 Combine like terms: -2.1875 + 2.1875 = 0.0000 0.0000 + x = 3.087904832 + 2.1875 x = 3.087904832 + 2.1875 Combine like terms: 3.087904832 + 2.1875 = 5.275404832 x = 5.275404832 Simplifying x = 5.275404832

Subproblem 2

x + -2.1875 = -3.087904832 Simplifying x + -2.1875 = -3.087904832 Reorder the terms: -2.1875 + x = -3.087904832 Solving -2.1875 + x = -3.087904832 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '2.1875' to each side of the equation. -2.1875 + 2.1875 + x = -3.087904832 + 2.1875 Combine like terms: -2.1875 + 2.1875 = 0.0000 0.0000 + x = -3.087904832 + 2.1875 x = -3.087904832 + 2.1875 Combine like terms: -3.087904832 + 2.1875 = -0.900404832 x = -0.900404832 Simplifying x = -0.900404832

Solution

The solution to the problem is based on the solutions from the subproblems. x = {5.275404832, -0.900404832}

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