5x^2-12x-13=0

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Solution for 5x^2-12x-13=0 equation:


Simplifying
5x2 + -12x + -13 = 0

Reorder the terms:
-13 + -12x + 5x2 = 0

Solving
-13 + -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'.
-2.6 + -2.4x + x2 = 0

Move the constant term to the right:

Add '2.6' to each side of the equation.
-2.6 + -2.4x + 2.6 + x2 = 0 + 2.6

Reorder the terms:
-2.6 + 2.6 + -2.4x + x2 = 0 + 2.6

Combine like terms: -2.6 + 2.6 = 0.0
0.0 + -2.4x + x2 = 0 + 2.6
-2.4x + x2 = 0 + 2.6

Combine like terms: 0 + 2.6 = 2.6
-2.4x + x2 = 2.6

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 = 2.6 + 1.44

Reorder the terms:
1.44 + -2.4x + x2 = 2.6 + 1.44

Combine like terms: 2.6 + 1.44 = 4.04
1.44 + -2.4x + x2 = 4.04

Factor a perfect square on the left side:
(x + -1.2)(x + -1.2) = 4.04

Calculate the square root of the right side: 2.009975124

Break this problem into two subproblems by setting 
(x + -1.2) equal to 2.009975124 and -2.009975124.

Subproblem 1

x + -1.2 = 2.009975124 Simplifying x + -1.2 = 2.009975124 Reorder the terms: -1.2 + x = 2.009975124 Solving -1.2 + x = 2.009975124 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 = 2.009975124 + 1.2 Combine like terms: -1.2 + 1.2 = 0.0 0.0 + x = 2.009975124 + 1.2 x = 2.009975124 + 1.2 Combine like terms: 2.009975124 + 1.2 = 3.209975124 x = 3.209975124 Simplifying x = 3.209975124

Subproblem 2

x + -1.2 = -2.009975124 Simplifying x + -1.2 = -2.009975124 Reorder the terms: -1.2 + x = -2.009975124 Solving -1.2 + x = -2.009975124 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 = -2.009975124 + 1.2 Combine like terms: -1.2 + 1.2 = 0.0 0.0 + x = -2.009975124 + 1.2 x = -2.009975124 + 1.2 Combine like terms: -2.009975124 + 1.2 = -0.809975124 x = -0.809975124 Simplifying x = -0.809975124

Solution

The solution to the problem is based on the solutions from the subproblems. x = {3.209975124, -0.809975124}

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