9x^2=26x+80

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Solution for 9x^2=26x+80 equation:


Simplifying
9x2 = 26x + 80

Reorder the terms:
9x2 = 80 + 26x

Solving
9x2 = 80 + 26x

Solving for variable 'x'.

Reorder the terms:
-80 + -26x + 9x2 = 80 + 26x + -80 + -26x

Reorder the terms:
-80 + -26x + 9x2 = 80 + -80 + 26x + -26x

Combine like terms: 80 + -80 = 0
-80 + -26x + 9x2 = 0 + 26x + -26x
-80 + -26x + 9x2 = 26x + -26x

Combine like terms: 26x + -26x = 0
-80 + -26x + 9x2 = 0

Begin completing the square.  Divide all terms by
9 the coefficient of the squared term: 

Divide each side by '9'.
-8.888888889 + -2.888888889x + x2 = 0

Move the constant term to the right:

Add '8.888888889' to each side of the equation.
-8.888888889 + -2.888888889x + 8.888888889 + x2 = 0 + 8.888888889

Reorder the terms:
-8.888888889 + 8.888888889 + -2.888888889x + x2 = 0 + 8.888888889

Combine like terms: -8.888888889 + 8.888888889 = 0.000000000
0.000000000 + -2.888888889x + x2 = 0 + 8.888888889
-2.888888889x + x2 = 0 + 8.888888889

Combine like terms: 0 + 8.888888889 = 8.888888889
-2.888888889x + x2 = 8.888888889

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 = 8.888888889 + 2.086419755

Reorder the terms:
2.086419755 + -2.888888889x + x2 = 8.888888889 + 2.086419755

Combine like terms: 8.888888889 + 2.086419755 = 10.975308644
2.086419755 + -2.888888889x + x2 = 10.975308644

Factor a perfect square on the left side:
(x + -1.444444445)(x + -1.444444445) = 10.975308644

Calculate the square root of the right side: 3.312900337

Break this problem into two subproblems by setting 
(x + -1.444444445) equal to 3.312900337 and -3.312900337.

Subproblem 1

x + -1.444444445 = 3.312900337 Simplifying x + -1.444444445 = 3.312900337 Reorder the terms: -1.444444445 + x = 3.312900337 Solving -1.444444445 + x = 3.312900337 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 = 3.312900337 + 1.444444445 Combine like terms: -1.444444445 + 1.444444445 = 0.000000000 0.000000000 + x = 3.312900337 + 1.444444445 x = 3.312900337 + 1.444444445 Combine like terms: 3.312900337 + 1.444444445 = 4.757344782 x = 4.757344782 Simplifying x = 4.757344782

Subproblem 2

x + -1.444444445 = -3.312900337 Simplifying x + -1.444444445 = -3.312900337 Reorder the terms: -1.444444445 + x = -3.312900337 Solving -1.444444445 + x = -3.312900337 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 = -3.312900337 + 1.444444445 Combine like terms: -1.444444445 + 1.444444445 = 0.000000000 0.000000000 + x = -3.312900337 + 1.444444445 x = -3.312900337 + 1.444444445 Combine like terms: -3.312900337 + 1.444444445 = -1.868455892 x = -1.868455892 Simplifying x = -1.868455892

Solution

The solution to the problem is based on the solutions from the subproblems. x = {4.757344782, -1.868455892}

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