9x^2+240x-1000=0

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Solution for 9x^2+240x-1000=0 equation:


Simplifying
9x2 + 240x + -1000 = 0

Reorder the terms:
-1000 + 240x + 9x2 = 0

Solving
-1000 + 240x + 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'.
-111.1111111 + 26.66666667x + x2 = 0

Move the constant term to the right:

Add '111.1111111' to each side of the equation.
-111.1111111 + 26.66666667x + 111.1111111 + x2 = 0 + 111.1111111

Reorder the terms:
-111.1111111 + 111.1111111 + 26.66666667x + x2 = 0 + 111.1111111

Combine like terms: -111.1111111 + 111.1111111 = 0.0000000
0.0000000 + 26.66666667x + x2 = 0 + 111.1111111
26.66666667x + x2 = 0 + 111.1111111

Combine like terms: 0 + 111.1111111 = 111.1111111
26.66666667x + x2 = 111.1111111

The x term is 26.66666667x.  Take half its coefficient (13.33333334).
Square it (177.7777780) and add it to both sides.

Add '177.7777780' to each side of the equation.
26.66666667x + 177.7777780 + x2 = 111.1111111 + 177.7777780

Reorder the terms:
177.7777780 + 26.66666667x + x2 = 111.1111111 + 177.7777780

Combine like terms: 111.1111111 + 177.7777780 = 288.8888891
177.7777780 + 26.66666667x + x2 = 288.8888891

Factor a perfect square on the left side:
(x + 13.33333334)(x + 13.33333334) = 288.8888891

Calculate the square root of the right side: 16.996731718

Break this problem into two subproblems by setting 
(x + 13.33333334) equal to 16.996731718 and -16.996731718.

Subproblem 1

x + 13.33333334 = 16.996731718 Simplifying x + 13.33333334 = 16.996731718 Reorder the terms: 13.33333334 + x = 16.996731718 Solving 13.33333334 + x = 16.996731718 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-13.33333334' to each side of the equation. 13.33333334 + -13.33333334 + x = 16.996731718 + -13.33333334 Combine like terms: 13.33333334 + -13.33333334 = 0.00000000 0.00000000 + x = 16.996731718 + -13.33333334 x = 16.996731718 + -13.33333334 Combine like terms: 16.996731718 + -13.33333334 = 3.663398378 x = 3.663398378 Simplifying x = 3.663398378

Subproblem 2

x + 13.33333334 = -16.996731718 Simplifying x + 13.33333334 = -16.996731718 Reorder the terms: 13.33333334 + x = -16.996731718 Solving 13.33333334 + x = -16.996731718 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-13.33333334' to each side of the equation. 13.33333334 + -13.33333334 + x = -16.996731718 + -13.33333334 Combine like terms: 13.33333334 + -13.33333334 = 0.00000000 0.00000000 + x = -16.996731718 + -13.33333334 x = -16.996731718 + -13.33333334 Combine like terms: -16.996731718 + -13.33333334 = -30.330065058 x = -30.330065058 Simplifying x = -30.330065058

Solution

The solution to the problem is based on the solutions from the subproblems. x = {3.663398378, -30.330065058}

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