8x^2-26x-9=0

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Solution for 8x^2-26x-9=0 equation:


Simplifying
8x2 + -26x + -9 = 0

Reorder the terms:
-9 + -26x + 8x2 = 0

Solving
-9 + -26x + 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'.
-1.125 + -3.25x + x2 = 0

Move the constant term to the right:

Add '1.125' to each side of the equation.
-1.125 + -3.25x + 1.125 + x2 = 0 + 1.125

Reorder the terms:
-1.125 + 1.125 + -3.25x + x2 = 0 + 1.125

Combine like terms: -1.125 + 1.125 = 0.000
0.000 + -3.25x + x2 = 0 + 1.125
-3.25x + x2 = 0 + 1.125

Combine like terms: 0 + 1.125 = 1.125
-3.25x + x2 = 1.125

The x term is -3.25x.  Take half its coefficient (-1.625).
Square it (2.640625) and add it to both sides.

Add '2.640625' to each side of the equation.
-3.25x + 2.640625 + x2 = 1.125 + 2.640625

Reorder the terms:
2.640625 + -3.25x + x2 = 1.125 + 2.640625

Combine like terms: 1.125 + 2.640625 = 3.765625
2.640625 + -3.25x + x2 = 3.765625

Factor a perfect square on the left side:
(x + -1.625)(x + -1.625) = 3.765625

Calculate the square root of the right side: 1.940521837

Break this problem into two subproblems by setting 
(x + -1.625) equal to 1.940521837 and -1.940521837.

Subproblem 1

x + -1.625 = 1.940521837 Simplifying x + -1.625 = 1.940521837 Reorder the terms: -1.625 + x = 1.940521837 Solving -1.625 + x = 1.940521837 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.625' to each side of the equation. -1.625 + 1.625 + x = 1.940521837 + 1.625 Combine like terms: -1.625 + 1.625 = 0.000 0.000 + x = 1.940521837 + 1.625 x = 1.940521837 + 1.625 Combine like terms: 1.940521837 + 1.625 = 3.565521837 x = 3.565521837 Simplifying x = 3.565521837

Subproblem 2

x + -1.625 = -1.940521837 Simplifying x + -1.625 = -1.940521837 Reorder the terms: -1.625 + x = -1.940521837 Solving -1.625 + x = -1.940521837 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.625' to each side of the equation. -1.625 + 1.625 + x = -1.940521837 + 1.625 Combine like terms: -1.625 + 1.625 = 0.000 0.000 + x = -1.940521837 + 1.625 x = -1.940521837 + 1.625 Combine like terms: -1.940521837 + 1.625 = -0.315521837 x = -0.315521837 Simplifying x = -0.315521837

Solution

The solution to the problem is based on the solutions from the subproblems. x = {3.565521837, -0.315521837}

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