25x^2-144x-16=0

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Solution for 25x^2-144x-16=0 equation:


Simplifying
25x2 + -144x + -16 = 0

Reorder the terms:
-16 + -144x + 25x2 = 0

Solving
-16 + -144x + 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'.
-0.64 + -5.76x + x2 = 0

Move the constant term to the right:

Add '0.64' to each side of the equation.
-0.64 + -5.76x + 0.64 + x2 = 0 + 0.64

Reorder the terms:
-0.64 + 0.64 + -5.76x + x2 = 0 + 0.64

Combine like terms: -0.64 + 0.64 = 0.00
0.00 + -5.76x + x2 = 0 + 0.64
-5.76x + x2 = 0 + 0.64

Combine like terms: 0 + 0.64 = 0.64
-5.76x + x2 = 0.64

The x term is -5.76x.  Take half its coefficient (-2.88).
Square it (8.2944) and add it to both sides.

Add '8.2944' to each side of the equation.
-5.76x + 8.2944 + x2 = 0.64 + 8.2944

Reorder the terms:
8.2944 + -5.76x + x2 = 0.64 + 8.2944

Combine like terms: 0.64 + 8.2944 = 8.9344
8.2944 + -5.76x + x2 = 8.9344

Factor a perfect square on the left side:
(x + -2.88)(x + -2.88) = 8.9344

Calculate the square root of the right side: 2.989046671

Break this problem into two subproblems by setting 
(x + -2.88) equal to 2.989046671 and -2.989046671.

Subproblem 1

x + -2.88 = 2.989046671 Simplifying x + -2.88 = 2.989046671 Reorder the terms: -2.88 + x = 2.989046671 Solving -2.88 + x = 2.989046671 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '2.88' to each side of the equation. -2.88 + 2.88 + x = 2.989046671 + 2.88 Combine like terms: -2.88 + 2.88 = 0.00 0.00 + x = 2.989046671 + 2.88 x = 2.989046671 + 2.88 Combine like terms: 2.989046671 + 2.88 = 5.869046671 x = 5.869046671 Simplifying x = 5.869046671

Subproblem 2

x + -2.88 = -2.989046671 Simplifying x + -2.88 = -2.989046671 Reorder the terms: -2.88 + x = -2.989046671 Solving -2.88 + x = -2.989046671 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '2.88' to each side of the equation. -2.88 + 2.88 + x = -2.989046671 + 2.88 Combine like terms: -2.88 + 2.88 = 0.00 0.00 + x = -2.989046671 + 2.88 x = -2.989046671 + 2.88 Combine like terms: -2.989046671 + 2.88 = -0.109046671 x = -0.109046671 Simplifying x = -0.109046671

Solution

The solution to the problem is based on the solutions from the subproblems. x = {5.869046671, -0.109046671}

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