8x^2-19x+9=0

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Solution for 8x^2-19x+9=0 equation:


Simplifying
8x2 + -19x + 9 = 0

Reorder the terms:
9 + -19x + 8x2 = 0

Solving
9 + -19x + 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 + -2.375x + x2 = 0

Move the constant term to the right:

Add '-1.125' to each side of the equation.
1.125 + -2.375x + -1.125 + x2 = 0 + -1.125

Reorder the terms:
1.125 + -1.125 + -2.375x + x2 = 0 + -1.125

Combine like terms: 1.125 + -1.125 = 0.000
0.000 + -2.375x + x2 = 0 + -1.125
-2.375x + x2 = 0 + -1.125

Combine like terms: 0 + -1.125 = -1.125
-2.375x + x2 = -1.125

The x term is -2.375x.  Take half its coefficient (-1.1875).
Square it (1.41015625) and add it to both sides.

Add '1.41015625' to each side of the equation.
-2.375x + 1.41015625 + x2 = -1.125 + 1.41015625

Reorder the terms:
1.41015625 + -2.375x + x2 = -1.125 + 1.41015625

Combine like terms: -1.125 + 1.41015625 = 0.28515625
1.41015625 + -2.375x + x2 = 0.28515625

Factor a perfect square on the left side:
(x + -1.1875)(x + -1.1875) = 0.28515625

Calculate the square root of the right side: 0.534000234

Break this problem into two subproblems by setting 
(x + -1.1875) equal to 0.534000234 and -0.534000234.

Subproblem 1

x + -1.1875 = 0.534000234 Simplifying x + -1.1875 = 0.534000234 Reorder the terms: -1.1875 + x = 0.534000234 Solving -1.1875 + x = 0.534000234 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.1875' to each side of the equation. -1.1875 + 1.1875 + x = 0.534000234 + 1.1875 Combine like terms: -1.1875 + 1.1875 = 0.0000 0.0000 + x = 0.534000234 + 1.1875 x = 0.534000234 + 1.1875 Combine like terms: 0.534000234 + 1.1875 = 1.721500234 x = 1.721500234 Simplifying x = 1.721500234

Subproblem 2

x + -1.1875 = -0.534000234 Simplifying x + -1.1875 = -0.534000234 Reorder the terms: -1.1875 + x = -0.534000234 Solving -1.1875 + x = -0.534000234 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.1875' to each side of the equation. -1.1875 + 1.1875 + x = -0.534000234 + 1.1875 Combine like terms: -1.1875 + 1.1875 = 0.0000 0.0000 + x = -0.534000234 + 1.1875 x = -0.534000234 + 1.1875 Combine like terms: -0.534000234 + 1.1875 = 0.653499766 x = 0.653499766 Simplifying x = 0.653499766

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.721500234, 0.653499766}

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