9x^2+131x-10=0

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Solution for 9x^2+131x-10=0 equation:


Simplifying
9x2 + 131x + -10 = 0

Reorder the terms:
-10 + 131x + 9x2 = 0

Solving
-10 + 131x + 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'.
-1.111111111 + 14.55555556x + x2 = 0

Move the constant term to the right:

Add '1.111111111' to each side of the equation.
-1.111111111 + 14.55555556x + 1.111111111 + x2 = 0 + 1.111111111

Reorder the terms:
-1.111111111 + 1.111111111 + 14.55555556x + x2 = 0 + 1.111111111

Combine like terms: -1.111111111 + 1.111111111 = 0.000000000
0.000000000 + 14.55555556x + x2 = 0 + 1.111111111
14.55555556x + x2 = 0 + 1.111111111

Combine like terms: 0 + 1.111111111 = 1.111111111
14.55555556x + x2 = 1.111111111

The x term is 14.55555556x.  Take half its coefficient (7.27777778).
Square it (52.96604942) and add it to both sides.

Add '52.96604942' to each side of the equation.
14.55555556x + 52.96604942 + x2 = 1.111111111 + 52.96604942

Reorder the terms:
52.96604942 + 14.55555556x + x2 = 1.111111111 + 52.96604942

Combine like terms: 1.111111111 + 52.96604942 = 54.077160531
52.96604942 + 14.55555556x + x2 = 54.077160531

Factor a perfect square on the left side:
(x + 7.27777778)(x + 7.27777778) = 54.077160531

Calculate the square root of the right side: 7.353717463

Break this problem into two subproblems by setting 
(x + 7.27777778) equal to 7.353717463 and -7.353717463.

Subproblem 1

x + 7.27777778 = 7.353717463 Simplifying x + 7.27777778 = 7.353717463 Reorder the terms: 7.27777778 + x = 7.353717463 Solving 7.27777778 + x = 7.353717463 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-7.27777778' to each side of the equation. 7.27777778 + -7.27777778 + x = 7.353717463 + -7.27777778 Combine like terms: 7.27777778 + -7.27777778 = 0.00000000 0.00000000 + x = 7.353717463 + -7.27777778 x = 7.353717463 + -7.27777778 Combine like terms: 7.353717463 + -7.27777778 = 0.075939683 x = 0.075939683 Simplifying x = 0.075939683

Subproblem 2

x + 7.27777778 = -7.353717463 Simplifying x + 7.27777778 = -7.353717463 Reorder the terms: 7.27777778 + x = -7.353717463 Solving 7.27777778 + x = -7.353717463 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-7.27777778' to each side of the equation. 7.27777778 + -7.27777778 + x = -7.353717463 + -7.27777778 Combine like terms: 7.27777778 + -7.27777778 = 0.00000000 0.00000000 + x = -7.353717463 + -7.27777778 x = -7.353717463 + -7.27777778 Combine like terms: -7.353717463 + -7.27777778 = -14.631495243 x = -14.631495243 Simplifying x = -14.631495243

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.075939683, -14.631495243}

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