5x^2-20x-31=0

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Solution for 5x^2-20x-31=0 equation:


Simplifying
5x2 + -20x + -31 = 0

Reorder the terms:
-31 + -20x + 5x2 = 0

Solving
-31 + -20x + 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'.
-6.2 + -4x + x2 = 0

Move the constant term to the right:

Add '6.2' to each side of the equation.
-6.2 + -4x + 6.2 + x2 = 0 + 6.2

Reorder the terms:
-6.2 + 6.2 + -4x + x2 = 0 + 6.2

Combine like terms: -6.2 + 6.2 = 0.0
0.0 + -4x + x2 = 0 + 6.2
-4x + x2 = 0 + 6.2

Combine like terms: 0 + 6.2 = 6.2
-4x + x2 = 6.2

The x term is -4x.  Take half its coefficient (-2).
Square it (4) and add it to both sides.

Add '4' to each side of the equation.
-4x + 4 + x2 = 6.2 + 4

Reorder the terms:
4 + -4x + x2 = 6.2 + 4

Combine like terms: 6.2 + 4 = 10.2
4 + -4x + x2 = 10.2

Factor a perfect square on the left side:
(x + -2)(x + -2) = 10.2

Calculate the square root of the right side: 3.193743885

Break this problem into two subproblems by setting 
(x + -2) equal to 3.193743885 and -3.193743885.

Subproblem 1

x + -2 = 3.193743885 Simplifying x + -2 = 3.193743885 Reorder the terms: -2 + x = 3.193743885 Solving -2 + x = 3.193743885 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '2' to each side of the equation. -2 + 2 + x = 3.193743885 + 2 Combine like terms: -2 + 2 = 0 0 + x = 3.193743885 + 2 x = 3.193743885 + 2 Combine like terms: 3.193743885 + 2 = 5.193743885 x = 5.193743885 Simplifying x = 5.193743885

Subproblem 2

x + -2 = -3.193743885 Simplifying x + -2 = -3.193743885 Reorder the terms: -2 + x = -3.193743885 Solving -2 + x = -3.193743885 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '2' to each side of the equation. -2 + 2 + x = -3.193743885 + 2 Combine like terms: -2 + 2 = 0 0 + x = -3.193743885 + 2 x = -3.193743885 + 2 Combine like terms: -3.193743885 + 2 = -1.193743885 x = -1.193743885 Simplifying x = -1.193743885

Solution

The solution to the problem is based on the solutions from the subproblems. x = {5.193743885, -1.193743885}

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