5x^2-12x-12=0

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


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

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

Solving
-12 + -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'.
-2.4 + -2.4x + x2 = 0

Move the constant term to the right:

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

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

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

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

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 = 2.4 + 1.44

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

Combine like terms: 2.4 + 1.44 = 3.84
1.44 + -2.4x + x2 = 3.84

Factor a perfect square on the left side:
(x + -1.2)(x + -1.2) = 3.84

Calculate the square root of the right side: 1.959591794

Break this problem into two subproblems by setting 
(x + -1.2) equal to 1.959591794 and -1.959591794.

Subproblem 1

x + -1.2 = 1.959591794 Simplifying x + -1.2 = 1.959591794 Reorder the terms: -1.2 + x = 1.959591794 Solving -1.2 + x = 1.959591794 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 = 1.959591794 + 1.2 Combine like terms: -1.2 + 1.2 = 0.0 0.0 + x = 1.959591794 + 1.2 x = 1.959591794 + 1.2 Combine like terms: 1.959591794 + 1.2 = 3.159591794 x = 3.159591794 Simplifying x = 3.159591794

Subproblem 2

x + -1.2 = -1.959591794 Simplifying x + -1.2 = -1.959591794 Reorder the terms: -1.2 + x = -1.959591794 Solving -1.2 + x = -1.959591794 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 = -1.959591794 + 1.2 Combine like terms: -1.2 + 1.2 = 0.0 0.0 + x = -1.959591794 + 1.2 x = -1.959591794 + 1.2 Combine like terms: -1.959591794 + 1.2 = -0.759591794 x = -0.759591794 Simplifying x = -0.759591794

Solution

The solution to the problem is based on the solutions from the subproblems. x = {3.159591794, -0.759591794}

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