5x^2-12x-5=0

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


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

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

Solving
-5 + -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'.
-1 + -2.4x + x2 = 0

Move the constant term to the right:

Add '1' to each side of the equation.
-1 + -2.4x + 1 + x2 = 0 + 1

Reorder the terms:
-1 + 1 + -2.4x + x2 = 0 + 1

Combine like terms: -1 + 1 = 0
0 + -2.4x + x2 = 0 + 1
-2.4x + x2 = 0 + 1

Combine like terms: 0 + 1 = 1
-2.4x + x2 = 1

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 = 1 + 1.44

Reorder the terms:
1.44 + -2.4x + x2 = 1 + 1.44

Combine like terms: 1 + 1.44 = 2.44
1.44 + -2.4x + x2 = 2.44

Factor a perfect square on the left side:
(x + -1.2)(x + -1.2) = 2.44

Calculate the square root of the right side: 1.562049935

Break this problem into two subproblems by setting 
(x + -1.2) equal to 1.562049935 and -1.562049935.

Subproblem 1

x + -1.2 = 1.562049935 Simplifying x + -1.2 = 1.562049935 Reorder the terms: -1.2 + x = 1.562049935 Solving -1.2 + x = 1.562049935 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 = 1.562049935 + 1.2 Combine like terms: -1.2 + 1.2 = 0.0 0.0 + x = 1.562049935 + 1.2 x = 1.562049935 + 1.2 Combine like terms: 1.562049935 + 1.2 = 2.762049935 x = 2.762049935 Simplifying x = 2.762049935

Subproblem 2

x + -1.2 = -1.562049935 Simplifying x + -1.2 = -1.562049935 Reorder the terms: -1.2 + x = -1.562049935 Solving -1.2 + x = -1.562049935 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 = -1.562049935 + 1.2 Combine like terms: -1.2 + 1.2 = 0.0 0.0 + x = -1.562049935 + 1.2 x = -1.562049935 + 1.2 Combine like terms: -1.562049935 + 1.2 = -0.362049935 x = -0.362049935 Simplifying x = -0.362049935

Solution

The solution to the problem is based on the solutions from the subproblems. x = {2.762049935, -0.362049935}

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