20x^2+10x-1-20=0

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Solution for 20x^2+10x-1-20=0 equation:


Simplifying
20x2 + 10x + -1 + -20 = 0

Reorder the terms:
-1 + -20 + 10x + 20x2 = 0

Combine like terms: -1 + -20 = -21
-21 + 10x + 20x2 = 0

Solving
-21 + 10x + 20x2 = 0

Solving for variable 'x'.

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

Divide each side by '20'.
-1.05 + 0.5x + x2 = 0

Move the constant term to the right:

Add '1.05' to each side of the equation.
-1.05 + 0.5x + 1.05 + x2 = 0 + 1.05

Reorder the terms:
-1.05 + 1.05 + 0.5x + x2 = 0 + 1.05

Combine like terms: -1.05 + 1.05 = 0.00
0.00 + 0.5x + x2 = 0 + 1.05
0.5x + x2 = 0 + 1.05

Combine like terms: 0 + 1.05 = 1.05
0.5x + x2 = 1.05

The x term is 0.5x.  Take half its coefficient (0.25).
Square it (0.0625) and add it to both sides.

Add '0.0625' to each side of the equation.
0.5x + 0.0625 + x2 = 1.05 + 0.0625

Reorder the terms:
0.0625 + 0.5x + x2 = 1.05 + 0.0625

Combine like terms: 1.05 + 0.0625 = 1.1125
0.0625 + 0.5x + x2 = 1.1125

Factor a perfect square on the left side:
(x + 0.25)(x + 0.25) = 1.1125

Calculate the square root of the right side: 1.054751155

Break this problem into two subproblems by setting 
(x + 0.25) equal to 1.054751155 and -1.054751155.

Subproblem 1

x + 0.25 = 1.054751155 Simplifying x + 0.25 = 1.054751155 Reorder the terms: 0.25 + x = 1.054751155 Solving 0.25 + x = 1.054751155 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.25' to each side of the equation. 0.25 + -0.25 + x = 1.054751155 + -0.25 Combine like terms: 0.25 + -0.25 = 0.00 0.00 + x = 1.054751155 + -0.25 x = 1.054751155 + -0.25 Combine like terms: 1.054751155 + -0.25 = 0.804751155 x = 0.804751155 Simplifying x = 0.804751155

Subproblem 2

x + 0.25 = -1.054751155 Simplifying x + 0.25 = -1.054751155 Reorder the terms: 0.25 + x = -1.054751155 Solving 0.25 + x = -1.054751155 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.25' to each side of the equation. 0.25 + -0.25 + x = -1.054751155 + -0.25 Combine like terms: 0.25 + -0.25 = 0.00 0.00 + x = -1.054751155 + -0.25 x = -1.054751155 + -0.25 Combine like terms: -1.054751155 + -0.25 = -1.304751155 x = -1.304751155 Simplifying x = -1.304751155

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.804751155, -1.304751155}

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