25x^2-12x-128=0

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Solution for 25x^2-12x-128=0 equation:


Simplifying
25x2 + -12x + -128 = 0

Reorder the terms:
-128 + -12x + 25x2 = 0

Solving
-128 + -12x + 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'.
-5.12 + -0.48x + x2 = 0

Move the constant term to the right:

Add '5.12' to each side of the equation.
-5.12 + -0.48x + 5.12 + x2 = 0 + 5.12

Reorder the terms:
-5.12 + 5.12 + -0.48x + x2 = 0 + 5.12

Combine like terms: -5.12 + 5.12 = 0.00
0.00 + -0.48x + x2 = 0 + 5.12
-0.48x + x2 = 0 + 5.12

Combine like terms: 0 + 5.12 = 5.12
-0.48x + x2 = 5.12

The x term is -0.48x.  Take half its coefficient (-0.24).
Square it (0.0576) and add it to both sides.

Add '0.0576' to each side of the equation.
-0.48x + 0.0576 + x2 = 5.12 + 0.0576

Reorder the terms:
0.0576 + -0.48x + x2 = 5.12 + 0.0576

Combine like terms: 5.12 + 0.0576 = 5.1776
0.0576 + -0.48x + x2 = 5.1776

Factor a perfect square on the left side:
(x + -0.24)(x + -0.24) = 5.1776

Calculate the square root of the right side: 2.275434025

Break this problem into two subproblems by setting 
(x + -0.24) equal to 2.275434025 and -2.275434025.

Subproblem 1

x + -0.24 = 2.275434025 Simplifying x + -0.24 = 2.275434025 Reorder the terms: -0.24 + x = 2.275434025 Solving -0.24 + x = 2.275434025 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.24' to each side of the equation. -0.24 + 0.24 + x = 2.275434025 + 0.24 Combine like terms: -0.24 + 0.24 = 0.00 0.00 + x = 2.275434025 + 0.24 x = 2.275434025 + 0.24 Combine like terms: 2.275434025 + 0.24 = 2.515434025 x = 2.515434025 Simplifying x = 2.515434025

Subproblem 2

x + -0.24 = -2.275434025 Simplifying x + -0.24 = -2.275434025 Reorder the terms: -0.24 + x = -2.275434025 Solving -0.24 + x = -2.275434025 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.24' to each side of the equation. -0.24 + 0.24 + x = -2.275434025 + 0.24 Combine like terms: -0.24 + 0.24 = 0.00 0.00 + x = -2.275434025 + 0.24 x = -2.275434025 + 0.24 Combine like terms: -2.275434025 + 0.24 = -2.035434025 x = -2.035434025 Simplifying x = -2.035434025

Solution

The solution to the problem is based on the solutions from the subproblems. x = {2.515434025, -2.035434025}

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