5x^2-12x-144=0

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Solution for 5x^2-12x-144=0 equation:


Simplifying
5x2 + -12x + -144 = 0

Reorder the terms:
-144 + -12x + 5x2 = 0

Solving
-144 + -12x + 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 + -2.4x + x2 = 0

Move the constant term to the right:

Add '28.8' to each side of the equation.
-28.8 + -2.4x + 28.8 + x2 = 0 + 28.8

Reorder the terms:
-28.8 + 28.8 + -2.4x + x2 = 0 + 28.8

Combine like terms: -28.8 + 28.8 = 0.0
0.0 + -2.4x + x2 = 0 + 28.8
-2.4x + x2 = 0 + 28.8

Combine like terms: 0 + 28.8 = 28.8
-2.4x + x2 = 28.8

The x term is -2.4x.  Take half its coefficient (-1.2).
Square it (1.44) and add it to both sides.

Add '1.44' to each side of the equation.
-2.4x + 1.44 + x2 = 28.8 + 1.44

Reorder the terms:
1.44 + -2.4x + x2 = 28.8 + 1.44

Combine like terms: 28.8 + 1.44 = 30.24
1.44 + -2.4x + x2 = 30.24

Factor a perfect square on the left side:
(x + -1.2)(x + -1.2) = 30.24

Calculate the square root of the right side: 5.499090834

Break this problem into two subproblems by setting 
(x + -1.2) equal to 5.499090834 and -5.499090834.

Subproblem 1

x + -1.2 = 5.499090834 Simplifying x + -1.2 = 5.499090834 Reorder the terms: -1.2 + x = 5.499090834 Solving -1.2 + x = 5.499090834 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.2' to each side of the equation. -1.2 + 1.2 + x = 5.499090834 + 1.2 Combine like terms: -1.2 + 1.2 = 0.0 0.0 + x = 5.499090834 + 1.2 x = 5.499090834 + 1.2 Combine like terms: 5.499090834 + 1.2 = 6.699090834 x = 6.699090834 Simplifying x = 6.699090834

Subproblem 2

x + -1.2 = -5.499090834 Simplifying x + -1.2 = -5.499090834 Reorder the terms: -1.2 + x = -5.499090834 Solving -1.2 + x = -5.499090834 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.2' to each side of the equation. -1.2 + 1.2 + x = -5.499090834 + 1.2 Combine like terms: -1.2 + 1.2 = 0.0 0.0 + x = -5.499090834 + 1.2 x = -5.499090834 + 1.2 Combine like terms: -5.499090834 + 1.2 = -4.299090834 x = -4.299090834 Simplifying x = -4.299090834

Solution

The solution to the problem is based on the solutions from the subproblems. x = {6.699090834, -4.299090834}

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