5x^2-26x-5=0

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Solution for 5x^2-26x-5=0 equation:


Simplifying
5x2 + -26x + -5 = 0

Reorder the terms:
-5 + -26x + 5x2 = 0

Solving
-5 + -26x + 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 + -5.2x + x2 = 0

Move the constant term to the right:

Add '1' to each side of the equation.
-1 + -5.2x + 1 + x2 = 0 + 1

Reorder the terms:
-1 + 1 + -5.2x + x2 = 0 + 1

Combine like terms: -1 + 1 = 0
0 + -5.2x + x2 = 0 + 1
-5.2x + x2 = 0 + 1

Combine like terms: 0 + 1 = 1
-5.2x + x2 = 1

The x term is -5.2x.  Take half its coefficient (-2.6).
Square it (6.76) and add it to both sides.

Add '6.76' to each side of the equation.
-5.2x + 6.76 + x2 = 1 + 6.76

Reorder the terms:
6.76 + -5.2x + x2 = 1 + 6.76

Combine like terms: 1 + 6.76 = 7.76
6.76 + -5.2x + x2 = 7.76

Factor a perfect square on the left side:
(x + -2.6)(x + -2.6) = 7.76

Calculate the square root of the right side: 2.785677655

Break this problem into two subproblems by setting 
(x + -2.6) equal to 2.785677655 and -2.785677655.

Subproblem 1

x + -2.6 = 2.785677655 Simplifying x + -2.6 = 2.785677655 Reorder the terms: -2.6 + x = 2.785677655 Solving -2.6 + x = 2.785677655 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '2.6' to each side of the equation. -2.6 + 2.6 + x = 2.785677655 + 2.6 Combine like terms: -2.6 + 2.6 = 0.0 0.0 + x = 2.785677655 + 2.6 x = 2.785677655 + 2.6 Combine like terms: 2.785677655 + 2.6 = 5.385677655 x = 5.385677655 Simplifying x = 5.385677655

Subproblem 2

x + -2.6 = -2.785677655 Simplifying x + -2.6 = -2.785677655 Reorder the terms: -2.6 + x = -2.785677655 Solving -2.6 + x = -2.785677655 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '2.6' to each side of the equation. -2.6 + 2.6 + x = -2.785677655 + 2.6 Combine like terms: -2.6 + 2.6 = 0.0 0.0 + x = -2.785677655 + 2.6 x = -2.785677655 + 2.6 Combine like terms: -2.785677655 + 2.6 = -0.185677655 x = -0.185677655 Simplifying x = -0.185677655

Solution

The solution to the problem is based on the solutions from the subproblems. x = {5.385677655, -0.185677655}

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