0=5x^2-13x-5

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


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

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

Solving
0 = -5 + -13x + 5x2

Solving for variable 'x'.

Combine like terms: 0 + 5 = 5
5 + 13x + -5x2 = -5 + -13x + 5x2 + 5 + 13x + -5x2

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

Combine like terms: -5 + 5 = 0
5 + 13x + -5x2 = 0 + -13x + 13x + 5x2 + -5x2
5 + 13x + -5x2 = -13x + 13x + 5x2 + -5x2

Combine like terms: -13x + 13x = 0
5 + 13x + -5x2 = 0 + 5x2 + -5x2
5 + 13x + -5x2 = 5x2 + -5x2

Combine like terms: 5x2 + -5x2 = 0
5 + 13x + -5x2 = 0

Begin completing the square.  Divide all terms by
-5 the coefficient of the squared term: 

Divide each side by '-5'.
-1 + -2.6x + x2 = 0

Move the constant term to the right:

Add '1' to each side of the equation.
-1 + -2.6x + 1 + x2 = 0 + 1

Reorder the terms:
-1 + 1 + -2.6x + x2 = 0 + 1

Combine like terms: -1 + 1 = 0
0 + -2.6x + x2 = 0 + 1
-2.6x + x2 = 0 + 1

Combine like terms: 0 + 1 = 1
-2.6x + x2 = 1

The x term is -2.6x.  Take half its coefficient (-1.3).
Square it (1.69) and add it to both sides.

Add '1.69' to each side of the equation.
-2.6x + 1.69 + x2 = 1 + 1.69

Reorder the terms:
1.69 + -2.6x + x2 = 1 + 1.69

Combine like terms: 1 + 1.69 = 2.69
1.69 + -2.6x + x2 = 2.69

Factor a perfect square on the left side:
(x + -1.3)(x + -1.3) = 2.69

Calculate the square root of the right side: 1.640121947

Break this problem into two subproblems by setting 
(x + -1.3) equal to 1.640121947 and -1.640121947.

Subproblem 1

x + -1.3 = 1.640121947 Simplifying x + -1.3 = 1.640121947 Reorder the terms: -1.3 + x = 1.640121947 Solving -1.3 + x = 1.640121947 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.3' to each side of the equation. -1.3 + 1.3 + x = 1.640121947 + 1.3 Combine like terms: -1.3 + 1.3 = 0.0 0.0 + x = 1.640121947 + 1.3 x = 1.640121947 + 1.3 Combine like terms: 1.640121947 + 1.3 = 2.940121947 x = 2.940121947 Simplifying x = 2.940121947

Subproblem 2

x + -1.3 = -1.640121947 Simplifying x + -1.3 = -1.640121947 Reorder the terms: -1.3 + x = -1.640121947 Solving -1.3 + x = -1.640121947 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.3' to each side of the equation. -1.3 + 1.3 + x = -1.640121947 + 1.3 Combine like terms: -1.3 + 1.3 = 0.0 0.0 + x = -1.640121947 + 1.3 x = -1.640121947 + 1.3 Combine like terms: -1.640121947 + 1.3 = -0.340121947 x = -0.340121947 Simplifying x = -0.340121947

Solution

The solution to the problem is based on the solutions from the subproblems. x = {2.940121947, -0.340121947}

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