5x^2-72x-216=0

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Solution for 5x^2-72x-216=0 equation:


Simplifying
5x2 + -72x + -216 = 0

Reorder the terms:
-216 + -72x + 5x2 = 0

Solving
-216 + -72x + 5x2 = 0

Solving for variable 'x'.

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

Divide each side by '5'.
-43.2 + -14.4x + x2 = 0

Move the constant term to the right:

Add '43.2' to each side of the equation.
-43.2 + -14.4x + 43.2 + x2 = 0 + 43.2

Reorder the terms:
-43.2 + 43.2 + -14.4x + x2 = 0 + 43.2

Combine like terms: -43.2 + 43.2 = 0.0
0.0 + -14.4x + x2 = 0 + 43.2
-14.4x + x2 = 0 + 43.2

Combine like terms: 0 + 43.2 = 43.2
-14.4x + x2 = 43.2

The x term is -14.4x.  Take half its coefficient (-7.2).
Square it (51.84) and add it to both sides.

Add '51.84' to each side of the equation.
-14.4x + 51.84 + x2 = 43.2 + 51.84

Reorder the terms:
51.84 + -14.4x + x2 = 43.2 + 51.84

Combine like terms: 43.2 + 51.84 = 95.04
51.84 + -14.4x + x2 = 95.04

Factor a perfect square on the left side:
(x + -7.2)(x + -7.2) = 95.04

Calculate the square root of the right side: 9.748846086

Break this problem into two subproblems by setting 
(x + -7.2) equal to 9.748846086 and -9.748846086.

Subproblem 1

x + -7.2 = 9.748846086 Simplifying x + -7.2 = 9.748846086 Reorder the terms: -7.2 + x = 9.748846086 Solving -7.2 + x = 9.748846086 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '7.2' to each side of the equation. -7.2 + 7.2 + x = 9.748846086 + 7.2 Combine like terms: -7.2 + 7.2 = 0.0 0.0 + x = 9.748846086 + 7.2 x = 9.748846086 + 7.2 Combine like terms: 9.748846086 + 7.2 = 16.948846086 x = 16.948846086 Simplifying x = 16.948846086

Subproblem 2

x + -7.2 = -9.748846086 Simplifying x + -7.2 = -9.748846086 Reorder the terms: -7.2 + x = -9.748846086 Solving -7.2 + x = -9.748846086 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '7.2' to each side of the equation. -7.2 + 7.2 + x = -9.748846086 + 7.2 Combine like terms: -7.2 + 7.2 = 0.0 0.0 + x = -9.748846086 + 7.2 x = -9.748846086 + 7.2 Combine like terms: -9.748846086 + 7.2 = -2.548846086 x = -2.548846086 Simplifying x = -2.548846086

Solution

The solution to the problem is based on the solutions from the subproblems. x = {16.948846086, -2.548846086}

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