16x^2-72x-9=0

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Solution for 16x^2-72x-9=0 equation:


Simplifying
16x2 + -72x + -9 = 0

Reorder the terms:
-9 + -72x + 16x2 = 0

Solving
-9 + -72x + 16x2 = 0

Solving for variable 'x'.

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

Divide each side by '16'.
-0.5625 + -4.5x + x2 = 0

Move the constant term to the right:

Add '0.5625' to each side of the equation.
-0.5625 + -4.5x + 0.5625 + x2 = 0 + 0.5625

Reorder the terms:
-0.5625 + 0.5625 + -4.5x + x2 = 0 + 0.5625

Combine like terms: -0.5625 + 0.5625 = 0.0000
0.0000 + -4.5x + x2 = 0 + 0.5625
-4.5x + x2 = 0 + 0.5625

Combine like terms: 0 + 0.5625 = 0.5625
-4.5x + x2 = 0.5625

The x term is -4.5x.  Take half its coefficient (-2.25).
Square it (5.0625) and add it to both sides.

Add '5.0625' to each side of the equation.
-4.5x + 5.0625 + x2 = 0.5625 + 5.0625

Reorder the terms:
5.0625 + -4.5x + x2 = 0.5625 + 5.0625

Combine like terms: 0.5625 + 5.0625 = 5.625
5.0625 + -4.5x + x2 = 5.625

Factor a perfect square on the left side:
(x + -2.25)(x + -2.25) = 5.625

Calculate the square root of the right side: 2.371708245

Break this problem into two subproblems by setting 
(x + -2.25) equal to 2.371708245 and -2.371708245.

Subproblem 1

x + -2.25 = 2.371708245 Simplifying x + -2.25 = 2.371708245 Reorder the terms: -2.25 + x = 2.371708245 Solving -2.25 + x = 2.371708245 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '2.25' to each side of the equation. -2.25 + 2.25 + x = 2.371708245 + 2.25 Combine like terms: -2.25 + 2.25 = 0.00 0.00 + x = 2.371708245 + 2.25 x = 2.371708245 + 2.25 Combine like terms: 2.371708245 + 2.25 = 4.621708245 x = 4.621708245 Simplifying x = 4.621708245

Subproblem 2

x + -2.25 = -2.371708245 Simplifying x + -2.25 = -2.371708245 Reorder the terms: -2.25 + x = -2.371708245 Solving -2.25 + x = -2.371708245 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '2.25' to each side of the equation. -2.25 + 2.25 + x = -2.371708245 + 2.25 Combine like terms: -2.25 + 2.25 = 0.00 0.00 + x = -2.371708245 + 2.25 x = -2.371708245 + 2.25 Combine like terms: -2.371708245 + 2.25 = -0.121708245 x = -0.121708245 Simplifying x = -0.121708245

Solution

The solution to the problem is based on the solutions from the subproblems. x = {4.621708245, -0.121708245}

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