9x^2+26x+8=0

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


Simplifying
9x2 + 26x + 8 = 0

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

Solving
8 + 26x + 9x2 = 0

Solving for variable 'x'.

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

Divide each side by '9'.
0.8888888889 + 2.888888889x + x2 = 0

Move the constant term to the right:

Add '-0.8888888889' to each side of the equation.
0.8888888889 + 2.888888889x + -0.8888888889 + x2 = 0 + -0.8888888889

Reorder the terms:
0.8888888889 + -0.8888888889 + 2.888888889x + x2 = 0 + -0.8888888889

Combine like terms: 0.8888888889 + -0.8888888889 = 0.0000000000
0.0000000000 + 2.888888889x + x2 = 0 + -0.8888888889
2.888888889x + x2 = 0 + -0.8888888889

Combine like terms: 0 + -0.8888888889 = -0.8888888889
2.888888889x + x2 = -0.8888888889

The x term is 2.888888889x.  Take half its coefficient (1.444444445).
Square it (2.086419755) and add it to both sides.

Add '2.086419755' to each side of the equation.
2.888888889x + 2.086419755 + x2 = -0.8888888889 + 2.086419755

Reorder the terms:
2.086419755 + 2.888888889x + x2 = -0.8888888889 + 2.086419755

Combine like terms: -0.8888888889 + 2.086419755 = 1.1975308661
2.086419755 + 2.888888889x + x2 = 1.1975308661

Factor a perfect square on the left side:
(x + 1.444444445)(x + 1.444444445) = 1.1975308661

Calculate the square root of the right side: 1.094317534

Break this problem into two subproblems by setting 
(x + 1.444444445) equal to 1.094317534 and -1.094317534.

Subproblem 1

x + 1.444444445 = 1.094317534 Simplifying x + 1.444444445 = 1.094317534 Reorder the terms: 1.444444445 + x = 1.094317534 Solving 1.444444445 + x = 1.094317534 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.444444445' to each side of the equation. 1.444444445 + -1.444444445 + x = 1.094317534 + -1.444444445 Combine like terms: 1.444444445 + -1.444444445 = 0.000000000 0.000000000 + x = 1.094317534 + -1.444444445 x = 1.094317534 + -1.444444445 Combine like terms: 1.094317534 + -1.444444445 = -0.350126911 x = -0.350126911 Simplifying x = -0.350126911

Subproblem 2

x + 1.444444445 = -1.094317534 Simplifying x + 1.444444445 = -1.094317534 Reorder the terms: 1.444444445 + x = -1.094317534 Solving 1.444444445 + x = -1.094317534 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.444444445' to each side of the equation. 1.444444445 + -1.444444445 + x = -1.094317534 + -1.444444445 Combine like terms: 1.444444445 + -1.444444445 = 0.000000000 0.000000000 + x = -1.094317534 + -1.444444445 x = -1.094317534 + -1.444444445 Combine like terms: -1.094317534 + -1.444444445 = -2.538761979 x = -2.538761979 Simplifying x = -2.538761979

Solution

The solution to the problem is based on the solutions from the subproblems. x = {-0.350126911, -2.538761979}

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