9x^2-43x-130=0

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Solution for 9x^2-43x-130=0 equation:


Simplifying
9x2 + -43x + -130 = 0

Reorder the terms:
-130 + -43x + 9x2 = 0

Solving
-130 + -43x + 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'.
-14.44444444 + -4.777777778x + x2 = 0

Move the constant term to the right:

Add '14.44444444' to each side of the equation.
-14.44444444 + -4.777777778x + 14.44444444 + x2 = 0 + 14.44444444

Reorder the terms:
-14.44444444 + 14.44444444 + -4.777777778x + x2 = 0 + 14.44444444

Combine like terms: -14.44444444 + 14.44444444 = 0.00000000
0.00000000 + -4.777777778x + x2 = 0 + 14.44444444
-4.777777778x + x2 = 0 + 14.44444444

Combine like terms: 0 + 14.44444444 = 14.44444444
-4.777777778x + x2 = 14.44444444

The x term is -4.777777778x.  Take half its coefficient (-2.388888889).
Square it (5.706790124) and add it to both sides.

Add '5.706790124' to each side of the equation.
-4.777777778x + 5.706790124 + x2 = 14.44444444 + 5.706790124

Reorder the terms:
5.706790124 + -4.777777778x + x2 = 14.44444444 + 5.706790124

Combine like terms: 14.44444444 + 5.706790124 = 20.151234564
5.706790124 + -4.777777778x + x2 = 20.151234564

Factor a perfect square on the left side:
(x + -2.388888889)(x + -2.388888889) = 20.151234564

Calculate the square root of the right side: 4.489012649

Break this problem into two subproblems by setting 
(x + -2.388888889) equal to 4.489012649 and -4.489012649.

Subproblem 1

x + -2.388888889 = 4.489012649 Simplifying x + -2.388888889 = 4.489012649 Reorder the terms: -2.388888889 + x = 4.489012649 Solving -2.388888889 + x = 4.489012649 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '2.388888889' to each side of the equation. -2.388888889 + 2.388888889 + x = 4.489012649 + 2.388888889 Combine like terms: -2.388888889 + 2.388888889 = 0.000000000 0.000000000 + x = 4.489012649 + 2.388888889 x = 4.489012649 + 2.388888889 Combine like terms: 4.489012649 + 2.388888889 = 6.877901538 x = 6.877901538 Simplifying x = 6.877901538

Subproblem 2

x + -2.388888889 = -4.489012649 Simplifying x + -2.388888889 = -4.489012649 Reorder the terms: -2.388888889 + x = -4.489012649 Solving -2.388888889 + x = -4.489012649 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '2.388888889' to each side of the equation. -2.388888889 + 2.388888889 + x = -4.489012649 + 2.388888889 Combine like terms: -2.388888889 + 2.388888889 = 0.000000000 0.000000000 + x = -4.489012649 + 2.388888889 x = -4.489012649 + 2.388888889 Combine like terms: -4.489012649 + 2.388888889 = -2.10012376 x = -2.10012376 Simplifying x = -2.10012376

Solution

The solution to the problem is based on the solutions from the subproblems. x = {6.877901538, -2.10012376}

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