4x^2+20x-113=0

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Solution for 4x^2+20x-113=0 equation:


Simplifying
4x2 + 20x + -113 = 0

Reorder the terms:
-113 + 20x + 4x2 = 0

Solving
-113 + 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'.
-28.25 + 5x + x2 = 0

Move the constant term to the right:

Add '28.25' to each side of the equation.
-28.25 + 5x + 28.25 + x2 = 0 + 28.25

Reorder the terms:
-28.25 + 28.25 + 5x + x2 = 0 + 28.25

Combine like terms: -28.25 + 28.25 = 0.00
0.00 + 5x + x2 = 0 + 28.25
5x + x2 = 0 + 28.25

Combine like terms: 0 + 28.25 = 28.25
5x + x2 = 28.25

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 = 28.25 + 6.25

Reorder the terms:
6.25 + 5x + x2 = 28.25 + 6.25

Combine like terms: 28.25 + 6.25 = 34.5
6.25 + 5x + x2 = 34.5

Factor a perfect square on the left side:
(x + 2.5)(x + 2.5) = 34.5

Calculate the square root of the right side: 5.873670062

Break this problem into two subproblems by setting 
(x + 2.5) equal to 5.873670062 and -5.873670062.

Subproblem 1

x + 2.5 = 5.873670062 Simplifying x + 2.5 = 5.873670062 Reorder the terms: 2.5 + x = 5.873670062 Solving 2.5 + x = 5.873670062 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 = 5.873670062 + -2.5 Combine like terms: 2.5 + -2.5 = 0.0 0.0 + x = 5.873670062 + -2.5 x = 5.873670062 + -2.5 Combine like terms: 5.873670062 + -2.5 = 3.373670062 x = 3.373670062 Simplifying x = 3.373670062

Subproblem 2

x + 2.5 = -5.873670062 Simplifying x + 2.5 = -5.873670062 Reorder the terms: 2.5 + x = -5.873670062 Solving 2.5 + x = -5.873670062 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 = -5.873670062 + -2.5 Combine like terms: 2.5 + -2.5 = 0.0 0.0 + x = -5.873670062 + -2.5 x = -5.873670062 + -2.5 Combine like terms: -5.873670062 + -2.5 = -8.373670062 x = -8.373670062 Simplifying x = -8.373670062

Solution

The solution to the problem is based on the solutions from the subproblems. x = {3.373670062, -8.373670062}

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