9x^2+24x+8=0

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Solution for 9x^2+24x+8=0 equation:


Simplifying
9x2 + 24x + 8 = 0

Reorder the terms:
8 + 24x + 9x2 = 0

Solving
8 + 24x + 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 + 2.666666667x + x2 = 0

Move the constant term to the right:

Add '-0.8888888889' to each side of the equation.
0.8888888889 + 2.666666667x + -0.8888888889 + x2 = 0 + -0.8888888889

Reorder the terms:
0.8888888889 + -0.8888888889 + 2.666666667x + x2 = 0 + -0.8888888889

Combine like terms: 0.8888888889 + -0.8888888889 = 0.0000000000
0.0000000000 + 2.666666667x + x2 = 0 + -0.8888888889
2.666666667x + x2 = 0 + -0.8888888889

Combine like terms: 0 + -0.8888888889 = -0.8888888889
2.666666667x + x2 = -0.8888888889

The x term is 2.666666667x.  Take half its coefficient (1.333333334).
Square it (1.777777780) and add it to both sides.

Add '1.777777780' to each side of the equation.
2.666666667x + 1.777777780 + x2 = -0.8888888889 + 1.777777780

Reorder the terms:
1.777777780 + 2.666666667x + x2 = -0.8888888889 + 1.777777780

Combine like terms: -0.8888888889 + 1.777777780 = 0.8888888911
1.777777780 + 2.666666667x + x2 = 0.8888888911

Factor a perfect square on the left side:
(x + 1.333333334)(x + 1.333333334) = 0.8888888911

Calculate the square root of the right side: 0.942809043

Break this problem into two subproblems by setting 
(x + 1.333333334) equal to 0.942809043 and -0.942809043.

Subproblem 1

x + 1.333333334 = 0.942809043 Simplifying x + 1.333333334 = 0.942809043 Reorder the terms: 1.333333334 + x = 0.942809043 Solving 1.333333334 + x = 0.942809043 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.333333334' to each side of the equation. 1.333333334 + -1.333333334 + x = 0.942809043 + -1.333333334 Combine like terms: 1.333333334 + -1.333333334 = 0.000000000 0.000000000 + x = 0.942809043 + -1.333333334 x = 0.942809043 + -1.333333334 Combine like terms: 0.942809043 + -1.333333334 = -0.390524291 x = -0.390524291 Simplifying x = -0.390524291

Subproblem 2

x + 1.333333334 = -0.942809043 Simplifying x + 1.333333334 = -0.942809043 Reorder the terms: 1.333333334 + x = -0.942809043 Solving 1.333333334 + x = -0.942809043 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.333333334' to each side of the equation. 1.333333334 + -1.333333334 + x = -0.942809043 + -1.333333334 Combine like terms: 1.333333334 + -1.333333334 = 0.000000000 0.000000000 + x = -0.942809043 + -1.333333334 x = -0.942809043 + -1.333333334 Combine like terms: -0.942809043 + -1.333333334 = -2.276142377 x = -2.276142377 Simplifying x = -2.276142377

Solution

The solution to the problem is based on the solutions from the subproblems. x = {-0.390524291, -2.276142377}

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