(9x^2)-(180x)-6400=0

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Solution for (9x^2)-(180x)-6400=0 equation:


Simplifying
(9x2) + -1(180x) + -6400 = 0

Remove parenthesis around (180x)
(9x2) + -1 * 180x + -6400 = 0

Multiply -1 * 180
(9x2) + -180x + -6400 = 0

Reorder the terms:
-6400 + -180x + (9x2) = 0

Solving
-6400 + -180x + (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'.
-711.1111111 + -20x + x2 = 0

Move the constant term to the right:

Add '711.1111111' to each side of the equation.
-711.1111111 + -20x + 711.1111111 + x2 = 0 + 711.1111111

Reorder the terms:
-711.1111111 + 711.1111111 + -20x + x2 = 0 + 711.1111111

Combine like terms: -711.1111111 + 711.1111111 = 0.0000000
0.0000000 + -20x + x2 = 0 + 711.1111111
-20x + x2 = 0 + 711.1111111

Combine like terms: 0 + 711.1111111 = 711.1111111
-20x + x2 = 711.1111111

The x term is -20x.  Take half its coefficient (-10).
Square it (100) and add it to both sides.

Add '100' to each side of the equation.
-20x + 100 + x2 = 711.1111111 + 100

Reorder the terms:
100 + -20x + x2 = 711.1111111 + 100

Combine like terms: 711.1111111 + 100 = 811.1111111
100 + -20x + x2 = 811.1111111

Factor a perfect square on the left side:
((x) + -10)((x) + -10) = 811.1111111

Calculate the square root of the right side: 28.480012484

Break this problem into two subproblems by setting 
((x) + -10) equal to 28.480012484 and -28.480012484.

Subproblem 1

(x) + -10 = 28.480012484 Simplifying (x) + -10 = 28.480012484 x + -10 = 28.480012484 Reorder the terms: -10 + x = 28.480012484 Solving -10 + x = 28.480012484 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '10' to each side of the equation. -10 + 10 + x = 28.480012484 + 10 Combine like terms: -10 + 10 = 0 0 + x = 28.480012484 + 10 x = 28.480012484 + 10 Combine like terms: 28.480012484 + 10 = 38.480012484 x = 38.480012484 Simplifying x = 38.480012484

Subproblem 2

(x) + -10 = -28.480012484 Simplifying (x) + -10 = -28.480012484 x + -10 = -28.480012484 Reorder the terms: -10 + x = -28.480012484 Solving -10 + x = -28.480012484 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '10' to each side of the equation. -10 + 10 + x = -28.480012484 + 10 Combine like terms: -10 + 10 = 0 0 + x = -28.480012484 + 10 x = -28.480012484 + 10 Combine like terms: -28.480012484 + 10 = -18.480012484 x = -18.480012484 Simplifying x = -18.480012484

Solution

The solution to the problem is based on the solutions from the subproblems. x = {38.480012484, -18.480012484}

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