9x^2-72x-5=0

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Solution for 9x^2-72x-5=0 equation:


Simplifying
9x2 + -72x + -5 = 0

Reorder the terms:
-5 + -72x + 9x2 = 0

Solving
-5 + -72x + 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'.
-0.5555555556 + -8x + x2 = 0

Move the constant term to the right:

Add '0.5555555556' to each side of the equation.
-0.5555555556 + -8x + 0.5555555556 + x2 = 0 + 0.5555555556

Reorder the terms:
-0.5555555556 + 0.5555555556 + -8x + x2 = 0 + 0.5555555556

Combine like terms: -0.5555555556 + 0.5555555556 = 0.0000000000
0.0000000000 + -8x + x2 = 0 + 0.5555555556
-8x + x2 = 0 + 0.5555555556

Combine like terms: 0 + 0.5555555556 = 0.5555555556
-8x + x2 = 0.5555555556

The x term is -8x.  Take half its coefficient (-4).
Square it (16) and add it to both sides.

Add '16' to each side of the equation.
-8x + 16 + x2 = 0.5555555556 + 16

Reorder the terms:
16 + -8x + x2 = 0.5555555556 + 16

Combine like terms: 0.5555555556 + 16 = 16.5555555556
16 + -8x + x2 = 16.5555555556

Factor a perfect square on the left side:
(x + -4)(x + -4) = 16.5555555556

Calculate the square root of the right side: 4.068851872

Break this problem into two subproblems by setting 
(x + -4) equal to 4.068851872 and -4.068851872.

Subproblem 1

x + -4 = 4.068851872 Simplifying x + -4 = 4.068851872 Reorder the terms: -4 + x = 4.068851872 Solving -4 + x = 4.068851872 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '4' to each side of the equation. -4 + 4 + x = 4.068851872 + 4 Combine like terms: -4 + 4 = 0 0 + x = 4.068851872 + 4 x = 4.068851872 + 4 Combine like terms: 4.068851872 + 4 = 8.068851872 x = 8.068851872 Simplifying x = 8.068851872

Subproblem 2

x + -4 = -4.068851872 Simplifying x + -4 = -4.068851872 Reorder the terms: -4 + x = -4.068851872 Solving -4 + x = -4.068851872 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '4' to each side of the equation. -4 + 4 + x = -4.068851872 + 4 Combine like terms: -4 + 4 = 0 0 + x = -4.068851872 + 4 x = -4.068851872 + 4 Combine like terms: -4.068851872 + 4 = -0.068851872 x = -0.068851872 Simplifying x = -0.068851872

Solution

The solution to the problem is based on the solutions from the subproblems. x = {8.068851872, -0.068851872}

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