9x^2-16x-5=0

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Solution for 9x^2-16x-5=0 equation:


Simplifying
9x2 + -16x + -5 = 0

Reorder the terms:
-5 + -16x + 9x2 = 0

Solving
-5 + -16x + 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 + -1.777777778x + x2 = 0

Move the constant term to the right:

Add '0.5555555556' to each side of the equation.
-0.5555555556 + -1.777777778x + 0.5555555556 + x2 = 0 + 0.5555555556

Reorder the terms:
-0.5555555556 + 0.5555555556 + -1.777777778x + x2 = 0 + 0.5555555556

Combine like terms: -0.5555555556 + 0.5555555556 = 0.0000000000
0.0000000000 + -1.777777778x + x2 = 0 + 0.5555555556
-1.777777778x + x2 = 0 + 0.5555555556

Combine like terms: 0 + 0.5555555556 = 0.5555555556
-1.777777778x + x2 = 0.5555555556

The x term is -1.777777778x.  Take half its coefficient (-0.888888889).
Square it (0.7901234570) and add it to both sides.

Add '0.7901234570' to each side of the equation.
-1.777777778x + 0.7901234570 + x2 = 0.5555555556 + 0.7901234570

Reorder the terms:
0.7901234570 + -1.777777778x + x2 = 0.5555555556 + 0.7901234570

Combine like terms: 0.5555555556 + 0.7901234570 = 1.3456790126
0.7901234570 + -1.777777778x + x2 = 1.3456790126

Factor a perfect square on the left side:
(x + -0.888888889)(x + -0.888888889) = 1.3456790126

Calculate the square root of the right side: 1.160034057

Break this problem into two subproblems by setting 
(x + -0.888888889) equal to 1.160034057 and -1.160034057.

Subproblem 1

x + -0.888888889 = 1.160034057 Simplifying x + -0.888888889 = 1.160034057 Reorder the terms: -0.888888889 + x = 1.160034057 Solving -0.888888889 + x = 1.160034057 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.888888889' to each side of the equation. -0.888888889 + 0.888888889 + x = 1.160034057 + 0.888888889 Combine like terms: -0.888888889 + 0.888888889 = 0.000000000 0.000000000 + x = 1.160034057 + 0.888888889 x = 1.160034057 + 0.888888889 Combine like terms: 1.160034057 + 0.888888889 = 2.048922946 x = 2.048922946 Simplifying x = 2.048922946

Subproblem 2

x + -0.888888889 = -1.160034057 Simplifying x + -0.888888889 = -1.160034057 Reorder the terms: -0.888888889 + x = -1.160034057 Solving -0.888888889 + x = -1.160034057 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.888888889' to each side of the equation. -0.888888889 + 0.888888889 + x = -1.160034057 + 0.888888889 Combine like terms: -0.888888889 + 0.888888889 = 0.000000000 0.000000000 + x = -1.160034057 + 0.888888889 x = -1.160034057 + 0.888888889 Combine like terms: -1.160034057 + 0.888888889 = -0.271145168 x = -0.271145168 Simplifying x = -0.271145168

Solution

The solution to the problem is based on the solutions from the subproblems. x = {2.048922946, -0.271145168}

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