25x^2-9x-180=0

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Solution for 25x^2-9x-180=0 equation:


Simplifying
25x2 + -9x + -180 = 0

Reorder the terms:
-180 + -9x + 25x2 = 0

Solving
-180 + -9x + 25x2 = 0

Solving for variable 'x'.

Begin completing the square.  Divide all terms by
25 the coefficient of the squared term: 

Divide each side by '25'.
-7.2 + -0.36x + x2 = 0

Move the constant term to the right:

Add '7.2' to each side of the equation.
-7.2 + -0.36x + 7.2 + x2 = 0 + 7.2

Reorder the terms:
-7.2 + 7.2 + -0.36x + x2 = 0 + 7.2

Combine like terms: -7.2 + 7.2 = 0.0
0.0 + -0.36x + x2 = 0 + 7.2
-0.36x + x2 = 0 + 7.2

Combine like terms: 0 + 7.2 = 7.2
-0.36x + x2 = 7.2

The x term is -0.36x.  Take half its coefficient (-0.18).
Square it (0.0324) and add it to both sides.

Add '0.0324' to each side of the equation.
-0.36x + 0.0324 + x2 = 7.2 + 0.0324

Reorder the terms:
0.0324 + -0.36x + x2 = 7.2 + 0.0324

Combine like terms: 7.2 + 0.0324 = 7.2324
0.0324 + -0.36x + x2 = 7.2324

Factor a perfect square on the left side:
(x + -0.18)(x + -0.18) = 7.2324

Calculate the square root of the right side: 2.68931218

Break this problem into two subproblems by setting 
(x + -0.18) equal to 2.68931218 and -2.68931218.

Subproblem 1

x + -0.18 = 2.68931218 Simplifying x + -0.18 = 2.68931218 Reorder the terms: -0.18 + x = 2.68931218 Solving -0.18 + x = 2.68931218 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.18' to each side of the equation. -0.18 + 0.18 + x = 2.68931218 + 0.18 Combine like terms: -0.18 + 0.18 = 0.00 0.00 + x = 2.68931218 + 0.18 x = 2.68931218 + 0.18 Combine like terms: 2.68931218 + 0.18 = 2.86931218 x = 2.86931218 Simplifying x = 2.86931218

Subproblem 2

x + -0.18 = -2.68931218 Simplifying x + -0.18 = -2.68931218 Reorder the terms: -0.18 + x = -2.68931218 Solving -0.18 + x = -2.68931218 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.18' to each side of the equation. -0.18 + 0.18 + x = -2.68931218 + 0.18 Combine like terms: -0.18 + 0.18 = 0.00 0.00 + x = -2.68931218 + 0.18 x = -2.68931218 + 0.18 Combine like terms: -2.68931218 + 0.18 = -2.50931218 x = -2.50931218 Simplifying x = -2.50931218

Solution

The solution to the problem is based on the solutions from the subproblems. x = {2.86931218, -2.50931218}

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