9x^2-10x-8=0

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Solution for 9x^2-10x-8=0 equation:


Simplifying
9x2 + -10x + -8 = 0

Reorder the terms:
-8 + -10x + 9x2 = 0

Solving
-8 + -10x + 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 + -1.111111111x + x2 = 0

Move the constant term to the right:

Add '0.8888888889' to each side of the equation.
-0.8888888889 + -1.111111111x + 0.8888888889 + x2 = 0 + 0.8888888889

Reorder the terms:
-0.8888888889 + 0.8888888889 + -1.111111111x + x2 = 0 + 0.8888888889

Combine like terms: -0.8888888889 + 0.8888888889 = 0.0000000000
0.0000000000 + -1.111111111x + x2 = 0 + 0.8888888889
-1.111111111x + x2 = 0 + 0.8888888889

Combine like terms: 0 + 0.8888888889 = 0.8888888889
-1.111111111x + x2 = 0.8888888889

The x term is -1.111111111x.  Take half its coefficient (-0.5555555555).
Square it (0.3086419752) and add it to both sides.

Add '0.3086419752' to each side of the equation.
-1.111111111x + 0.3086419752 + x2 = 0.8888888889 + 0.3086419752

Reorder the terms:
0.3086419752 + -1.111111111x + x2 = 0.8888888889 + 0.3086419752

Combine like terms: 0.8888888889 + 0.3086419752 = 1.1975308641
0.3086419752 + -1.111111111x + x2 = 1.1975308641

Factor a perfect square on the left side:
(x + -0.5555555555)(x + -0.5555555555) = 1.1975308641

Calculate the square root of the right side: 1.094317533

Break this problem into two subproblems by setting 
(x + -0.5555555555) equal to 1.094317533 and -1.094317533.

Subproblem 1

x + -0.5555555555 = 1.094317533 Simplifying x + -0.5555555555 = 1.094317533 Reorder the terms: -0.5555555555 + x = 1.094317533 Solving -0.5555555555 + x = 1.094317533 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.5555555555' to each side of the equation. -0.5555555555 + 0.5555555555 + x = 1.094317533 + 0.5555555555 Combine like terms: -0.5555555555 + 0.5555555555 = 0.0000000000 0.0000000000 + x = 1.094317533 + 0.5555555555 x = 1.094317533 + 0.5555555555 Combine like terms: 1.094317533 + 0.5555555555 = 1.6498730885 x = 1.6498730885 Simplifying x = 1.6498730885

Subproblem 2

x + -0.5555555555 = -1.094317533 Simplifying x + -0.5555555555 = -1.094317533 Reorder the terms: -0.5555555555 + x = -1.094317533 Solving -0.5555555555 + x = -1.094317533 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.5555555555' to each side of the equation. -0.5555555555 + 0.5555555555 + x = -1.094317533 + 0.5555555555 Combine like terms: -0.5555555555 + 0.5555555555 = 0.0000000000 0.0000000000 + x = -1.094317533 + 0.5555555555 x = -1.094317533 + 0.5555555555 Combine like terms: -1.094317533 + 0.5555555555 = -0.5387619775 x = -0.5387619775 Simplifying x = -0.5387619775

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.6498730885, -0.5387619775}

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