0=20x^2-x-3

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Solution for 0=20x^2-x-3 equation:


Simplifying
0 = 20x2 + -1x + -3

Reorder the terms:
0 = -3 + -1x + 20x2

Solving
0 = -3 + -1x + 20x2

Solving for variable 'x'.

Combine like terms: 0 + 3 = 3
3 + x + -20x2 = -3 + -1x + 20x2 + 3 + x + -20x2

Reorder the terms:
3 + x + -20x2 = -3 + 3 + -1x + x + 20x2 + -20x2

Combine like terms: -3 + 3 = 0
3 + x + -20x2 = 0 + -1x + x + 20x2 + -20x2
3 + x + -20x2 = -1x + x + 20x2 + -20x2

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

Combine like terms: 20x2 + -20x2 = 0
3 + x + -20x2 = 0

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

Divide each side by '-20'.
-0.15 + -0.05x + x2 = 0

Move the constant term to the right:

Add '0.15' to each side of the equation.
-0.15 + -0.05x + 0.15 + x2 = 0 + 0.15

Reorder the terms:
-0.15 + 0.15 + -0.05x + x2 = 0 + 0.15

Combine like terms: -0.15 + 0.15 = 0.00
0.00 + -0.05x + x2 = 0 + 0.15
-0.05x + x2 = 0 + 0.15

Combine like terms: 0 + 0.15 = 0.15
-0.05x + x2 = 0.15

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

Add '0.25' to each side of the equation.
-0.05x + 0.25 + x2 = 0.15 + 0.25

Reorder the terms:
0.25 + -0.05x + x2 = 0.15 + 0.25

Combine like terms: 0.15 + 0.25 = 0.4
0.25 + -0.05x + x2 = 0.4

Factor a perfect square on the left side:
(x + 0.5)(x + 0.5) = 0.4

Calculate the square root of the right side: 0.632455532

Break this problem into two subproblems by setting 
(x + 0.5) equal to 0.632455532 and -0.632455532.

Subproblem 1

x + 0.5 = 0.632455532 Simplifying x + 0.5 = 0.632455532 Reorder the terms: 0.5 + x = 0.632455532 Solving 0.5 + x = 0.632455532 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.5' to each side of the equation. 0.5 + -0.5 + x = 0.632455532 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + x = 0.632455532 + -0.5 x = 0.632455532 + -0.5 Combine like terms: 0.632455532 + -0.5 = 0.132455532 x = 0.132455532 Simplifying x = 0.132455532

Subproblem 2

x + 0.5 = -0.632455532 Simplifying x + 0.5 = -0.632455532 Reorder the terms: 0.5 + x = -0.632455532 Solving 0.5 + x = -0.632455532 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.5' to each side of the equation. 0.5 + -0.5 + x = -0.632455532 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + x = -0.632455532 + -0.5 x = -0.632455532 + -0.5 Combine like terms: -0.632455532 + -0.5 = -1.132455532 x = -1.132455532 Simplifying x = -1.132455532

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.132455532, -1.132455532}

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