4x^2-20x-5=0

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Solution for 4x^2-20x-5=0 equation:


Simplifying
4x2 + -20x + -5 = 0

Reorder the terms:
-5 + -20x + 4x2 = 0

Solving
-5 + -20x + 4x2 = 0

Solving for variable 'x'.

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

Divide each side by '4'.
-1.25 + -5x + x2 = 0

Move the constant term to the right:

Add '1.25' to each side of the equation.
-1.25 + -5x + 1.25 + x2 = 0 + 1.25

Reorder the terms:
-1.25 + 1.25 + -5x + x2 = 0 + 1.25

Combine like terms: -1.25 + 1.25 = 0.00
0.00 + -5x + x2 = 0 + 1.25
-5x + x2 = 0 + 1.25

Combine like terms: 0 + 1.25 = 1.25
-5x + x2 = 1.25

The x term is -5x.  Take half its coefficient (-2.5).
Square it (6.25) and add it to both sides.

Add '6.25' to each side of the equation.
-5x + 6.25 + x2 = 1.25 + 6.25

Reorder the terms:
6.25 + -5x + x2 = 1.25 + 6.25

Combine like terms: 1.25 + 6.25 = 7.5
6.25 + -5x + x2 = 7.5

Factor a perfect square on the left side:
(x + -2.5)(x + -2.5) = 7.5

Calculate the square root of the right side: 2.738612788

Break this problem into two subproblems by setting 
(x + -2.5) equal to 2.738612788 and -2.738612788.

Subproblem 1

x + -2.5 = 2.738612788 Simplifying x + -2.5 = 2.738612788 Reorder the terms: -2.5 + x = 2.738612788 Solving -2.5 + x = 2.738612788 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '2.5' to each side of the equation. -2.5 + 2.5 + x = 2.738612788 + 2.5 Combine like terms: -2.5 + 2.5 = 0.0 0.0 + x = 2.738612788 + 2.5 x = 2.738612788 + 2.5 Combine like terms: 2.738612788 + 2.5 = 5.238612788 x = 5.238612788 Simplifying x = 5.238612788

Subproblem 2

x + -2.5 = -2.738612788 Simplifying x + -2.5 = -2.738612788 Reorder the terms: -2.5 + x = -2.738612788 Solving -2.5 + x = -2.738612788 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '2.5' to each side of the equation. -2.5 + 2.5 + x = -2.738612788 + 2.5 Combine like terms: -2.5 + 2.5 = 0.0 0.0 + x = -2.738612788 + 2.5 x = -2.738612788 + 2.5 Combine like terms: -2.738612788 + 2.5 = -0.238612788 x = -0.238612788 Simplifying x = -0.238612788

Solution

The solution to the problem is based on the solutions from the subproblems. x = {5.238612788, -0.238612788}

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