5x^2-36x-144=0

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Solution for 5x^2-36x-144=0 equation:


Simplifying
5x2 + -36x + -144 = 0

Reorder the terms:
-144 + -36x + 5x2 = 0

Solving
-144 + -36x + 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'.
-28.8 + -7.2x + x2 = 0

Move the constant term to the right:

Add '28.8' to each side of the equation.
-28.8 + -7.2x + 28.8 + x2 = 0 + 28.8

Reorder the terms:
-28.8 + 28.8 + -7.2x + x2 = 0 + 28.8

Combine like terms: -28.8 + 28.8 = 0.0
0.0 + -7.2x + x2 = 0 + 28.8
-7.2x + x2 = 0 + 28.8

Combine like terms: 0 + 28.8 = 28.8
-7.2x + x2 = 28.8

The x term is -7.2x.  Take half its coefficient (-3.6).
Square it (12.96) and add it to both sides.

Add '12.96' to each side of the equation.
-7.2x + 12.96 + x2 = 28.8 + 12.96

Reorder the terms:
12.96 + -7.2x + x2 = 28.8 + 12.96

Combine like terms: 28.8 + 12.96 = 41.76
12.96 + -7.2x + x2 = 41.76

Factor a perfect square on the left side:
(x + -3.6)(x + -3.6) = 41.76

Calculate the square root of the right side: 6.462197769

Break this problem into two subproblems by setting 
(x + -3.6) equal to 6.462197769 and -6.462197769.

Subproblem 1

x + -3.6 = 6.462197769 Simplifying x + -3.6 = 6.462197769 Reorder the terms: -3.6 + x = 6.462197769 Solving -3.6 + x = 6.462197769 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '3.6' to each side of the equation. -3.6 + 3.6 + x = 6.462197769 + 3.6 Combine like terms: -3.6 + 3.6 = 0.0 0.0 + x = 6.462197769 + 3.6 x = 6.462197769 + 3.6 Combine like terms: 6.462197769 + 3.6 = 10.062197769 x = 10.062197769 Simplifying x = 10.062197769

Subproblem 2

x + -3.6 = -6.462197769 Simplifying x + -3.6 = -6.462197769 Reorder the terms: -3.6 + x = -6.462197769 Solving -3.6 + x = -6.462197769 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '3.6' to each side of the equation. -3.6 + 3.6 + x = -6.462197769 + 3.6 Combine like terms: -3.6 + 3.6 = 0.0 0.0 + x = -6.462197769 + 3.6 x = -6.462197769 + 3.6 Combine like terms: -6.462197769 + 3.6 = -2.862197769 x = -2.862197769 Simplifying x = -2.862197769

Solution

The solution to the problem is based on the solutions from the subproblems. x = {10.062197769, -2.862197769}

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