9x^2-7x-5=0

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Solution for 9x^2-7x-5=0 equation:


Simplifying
9x2 + -7x + -5 = 0

Reorder the terms:
-5 + -7x + 9x2 = 0

Solving
-5 + -7x + 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'.
-0.5555555556 + -0.7777777778x + x2 = 0

Move the constant term to the right:

Add '0.5555555556' to each side of the equation.
-0.5555555556 + -0.7777777778x + 0.5555555556 + x2 = 0 + 0.5555555556

Reorder the terms:
-0.5555555556 + 0.5555555556 + -0.7777777778x + x2 = 0 + 0.5555555556

Combine like terms: -0.5555555556 + 0.5555555556 = 0.0000000000
0.0000000000 + -0.7777777778x + x2 = 0 + 0.5555555556
-0.7777777778x + x2 = 0 + 0.5555555556

Combine like terms: 0 + 0.5555555556 = 0.5555555556
-0.7777777778x + x2 = 0.5555555556

The x term is -0.7777777778x.  Take half its coefficient (-0.3888888889).
Square it (0.1512345679) and add it to both sides.

Add '0.1512345679' to each side of the equation.
-0.7777777778x + 0.1512345679 + x2 = 0.5555555556 + 0.1512345679

Reorder the terms:
0.1512345679 + -0.7777777778x + x2 = 0.5555555556 + 0.1512345679

Combine like terms: 0.5555555556 + 0.1512345679 = 0.7067901235
0.1512345679 + -0.7777777778x + x2 = 0.7067901235

Factor a perfect square on the left side:
(x + -0.3888888889)(x + -0.3888888889) = 0.7067901235

Calculate the square root of the right side: 0.840708108

Break this problem into two subproblems by setting 
(x + -0.3888888889) equal to 0.840708108 and -0.840708108.

Subproblem 1

x + -0.3888888889 = 0.840708108 Simplifying x + -0.3888888889 = 0.840708108 Reorder the terms: -0.3888888889 + x = 0.840708108 Solving -0.3888888889 + x = 0.840708108 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.3888888889' to each side of the equation. -0.3888888889 + 0.3888888889 + x = 0.840708108 + 0.3888888889 Combine like terms: -0.3888888889 + 0.3888888889 = 0.0000000000 0.0000000000 + x = 0.840708108 + 0.3888888889 x = 0.840708108 + 0.3888888889 Combine like terms: 0.840708108 + 0.3888888889 = 1.2295969969 x = 1.2295969969 Simplifying x = 1.2295969969

Subproblem 2

x + -0.3888888889 = -0.840708108 Simplifying x + -0.3888888889 = -0.840708108 Reorder the terms: -0.3888888889 + x = -0.840708108 Solving -0.3888888889 + x = -0.840708108 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.3888888889' to each side of the equation. -0.3888888889 + 0.3888888889 + x = -0.840708108 + 0.3888888889 Combine like terms: -0.3888888889 + 0.3888888889 = 0.0000000000 0.0000000000 + x = -0.840708108 + 0.3888888889 x = -0.840708108 + 0.3888888889 Combine like terms: -0.840708108 + 0.3888888889 = -0.4518192191 x = -0.4518192191 Simplifying x = -0.4518192191

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.2295969969, -0.4518192191}

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