5x^2-2x-26=0

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


Simplifying
5x2 + -2x + -26 = 0

Reorder the terms:
-26 + -2x + 5x2 = 0

Solving
-26 + -2x + 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'.
-5.2 + -0.4x + x2 = 0

Move the constant term to the right:

Add '5.2' to each side of the equation.
-5.2 + -0.4x + 5.2 + x2 = 0 + 5.2

Reorder the terms:
-5.2 + 5.2 + -0.4x + x2 = 0 + 5.2

Combine like terms: -5.2 + 5.2 = 0.0
0.0 + -0.4x + x2 = 0 + 5.2
-0.4x + x2 = 0 + 5.2

Combine like terms: 0 + 5.2 = 5.2
-0.4x + x2 = 5.2

The x term is -0.4x.  Take half its coefficient (-0.2).
Square it (0.04) and add it to both sides.

Add '0.04' to each side of the equation.
-0.4x + 0.04 + x2 = 5.2 + 0.04

Reorder the terms:
0.04 + -0.4x + x2 = 5.2 + 0.04

Combine like terms: 5.2 + 0.04 = 5.24
0.04 + -0.4x + x2 = 5.24

Factor a perfect square on the left side:
(x + -0.2)(x + -0.2) = 5.24

Calculate the square root of the right side: 2.289104628

Break this problem into two subproblems by setting 
(x + -0.2) equal to 2.289104628 and -2.289104628.

Subproblem 1

x + -0.2 = 2.289104628 Simplifying x + -0.2 = 2.289104628 Reorder the terms: -0.2 + x = 2.289104628 Solving -0.2 + x = 2.289104628 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.2' to each side of the equation. -0.2 + 0.2 + x = 2.289104628 + 0.2 Combine like terms: -0.2 + 0.2 = 0.0 0.0 + x = 2.289104628 + 0.2 x = 2.289104628 + 0.2 Combine like terms: 2.289104628 + 0.2 = 2.489104628 x = 2.489104628 Simplifying x = 2.489104628

Subproblem 2

x + -0.2 = -2.289104628 Simplifying x + -0.2 = -2.289104628 Reorder the terms: -0.2 + x = -2.289104628 Solving -0.2 + x = -2.289104628 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.2' to each side of the equation. -0.2 + 0.2 + x = -2.289104628 + 0.2 Combine like terms: -0.2 + 0.2 = 0.0 0.0 + x = -2.289104628 + 0.2 x = -2.289104628 + 0.2 Combine like terms: -2.289104628 + 0.2 = -2.089104628 x = -2.089104628 Simplifying x = -2.089104628

Solution

The solution to the problem is based on the solutions from the subproblems. x = {2.489104628, -2.089104628}

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