9x^2+x-25=0

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Solution for 9x^2+x-25=0 equation:


Simplifying
9x2 + x + -25 = 0

Reorder the terms:
-25 + x + 9x2 = 0

Solving
-25 + x + 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'.
-2.777777778 + 0.1111111111x + x2 = 0

Move the constant term to the right:

Add '2.777777778' to each side of the equation.
-2.777777778 + 0.1111111111x + 2.777777778 + x2 = 0 + 2.777777778

Reorder the terms:
-2.777777778 + 2.777777778 + 0.1111111111x + x2 = 0 + 2.777777778

Combine like terms: -2.777777778 + 2.777777778 = 0.000000000
0.000000000 + 0.1111111111x + x2 = 0 + 2.777777778
0.1111111111x + x2 = 0 + 2.777777778

Combine like terms: 0 + 2.777777778 = 2.777777778
0.1111111111x + x2 = 2.777777778

The x term is x.  Take half its coefficient (0.5).
Square it (0.25) and add it to both sides.

Add '0.25' to each side of the equation.
0.1111111111x + 0.25 + x2 = 2.777777778 + 0.25

Reorder the terms:
0.25 + 0.1111111111x + x2 = 2.777777778 + 0.25

Combine like terms: 2.777777778 + 0.25 = 3.027777778
0.25 + 0.1111111111x + x2 = 3.027777778

Factor a perfect square on the left side:
(x + 0.5)(x + 0.5) = 3.027777778

Calculate the square root of the right side: 1.740051085

Break this problem into two subproblems by setting 
(x + 0.5) equal to 1.740051085 and -1.740051085.

Subproblem 1

x + 0.5 = 1.740051085 Simplifying x + 0.5 = 1.740051085 Reorder the terms: 0.5 + x = 1.740051085 Solving 0.5 + x = 1.740051085 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.5' to each side of the equation. 0.5 + -0.5 + x = 1.740051085 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + x = 1.740051085 + -0.5 x = 1.740051085 + -0.5 Combine like terms: 1.740051085 + -0.5 = 1.240051085 x = 1.240051085 Simplifying x = 1.240051085

Subproblem 2

x + 0.5 = -1.740051085 Simplifying x + 0.5 = -1.740051085 Reorder the terms: 0.5 + x = -1.740051085 Solving 0.5 + x = -1.740051085 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.5' to each side of the equation. 0.5 + -0.5 + x = -1.740051085 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + x = -1.740051085 + -0.5 x = -1.740051085 + -0.5 Combine like terms: -1.740051085 + -0.5 = -2.240051085 x = -2.240051085 Simplifying x = -2.240051085

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.240051085, -2.240051085}

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