9x^2-26x-16=0

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Solution for 9x^2-26x-16=0 equation:


Simplifying
9x2 + -26x + -16 = 0

Reorder the terms:
-16 + -26x + 9x2 = 0

Solving
-16 + -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'.
-1.777777778 + -2.888888889x + x2 = 0

Move the constant term to the right:

Add '1.777777778' to each side of the equation.
-1.777777778 + -2.888888889x + 1.777777778 + x2 = 0 + 1.777777778

Reorder the terms:
-1.777777778 + 1.777777778 + -2.888888889x + x2 = 0 + 1.777777778

Combine like terms: -1.777777778 + 1.777777778 = 0.000000000
0.000000000 + -2.888888889x + x2 = 0 + 1.777777778
-2.888888889x + x2 = 0 + 1.777777778

Combine like terms: 0 + 1.777777778 = 1.777777778
-2.888888889x + x2 = 1.777777778

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 = 1.777777778 + 2.086419755

Reorder the terms:
2.086419755 + -2.888888889x + x2 = 1.777777778 + 2.086419755

Combine like terms: 1.777777778 + 2.086419755 = 3.864197533
2.086419755 + -2.888888889x + x2 = 3.864197533

Factor a perfect square on the left side:
(x + -1.444444445)(x + -1.444444445) = 3.864197533

Calculate the square root of the right side: 1.965756224

Break this problem into two subproblems by setting 
(x + -1.444444445) equal to 1.965756224 and -1.965756224.

Subproblem 1

x + -1.444444445 = 1.965756224 Simplifying x + -1.444444445 = 1.965756224 Reorder the terms: -1.444444445 + x = 1.965756224 Solving -1.444444445 + x = 1.965756224 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 = 1.965756224 + 1.444444445 Combine like terms: -1.444444445 + 1.444444445 = 0.000000000 0.000000000 + x = 1.965756224 + 1.444444445 x = 1.965756224 + 1.444444445 Combine like terms: 1.965756224 + 1.444444445 = 3.410200669 x = 3.410200669 Simplifying x = 3.410200669

Subproblem 2

x + -1.444444445 = -1.965756224 Simplifying x + -1.444444445 = -1.965756224 Reorder the terms: -1.444444445 + x = -1.965756224 Solving -1.444444445 + x = -1.965756224 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 = -1.965756224 + 1.444444445 Combine like terms: -1.444444445 + 1.444444445 = 0.000000000 0.000000000 + x = -1.965756224 + 1.444444445 x = -1.965756224 + 1.444444445 Combine like terms: -1.965756224 + 1.444444445 = -0.521311779 x = -0.521311779 Simplifying x = -0.521311779

Solution

The solution to the problem is based on the solutions from the subproblems. x = {3.410200669, -0.521311779}

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