20x^2-x-100=0

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Solution for 20x^2-x-100=0 equation:


Simplifying
20x2 + -1x + -100 = 0

Reorder the terms:
-100 + -1x + 20x2 = 0

Solving
-100 + -1x + 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'.
-5 + -0.05x + x2 = 0

Move the constant term to the right:

Add '5' to each side of the equation.
-5 + -0.05x + 5 + x2 = 0 + 5

Reorder the terms:
-5 + 5 + -0.05x + x2 = 0 + 5

Combine like terms: -5 + 5 = 0
0 + -0.05x + x2 = 0 + 5
-0.05x + x2 = 0 + 5

Combine like terms: 0 + 5 = 5
-0.05x + x2 = 5

The x term is -0.05x.  Take half its coefficient (-0.025).
Square it (0.000625) and add it to both sides.

Add '0.000625' to each side of the equation.
-0.05x + 0.000625 + x2 = 5 + 0.000625

Reorder the terms:
0.000625 + -0.05x + x2 = 5 + 0.000625

Combine like terms: 5 + 0.000625 = 5.000625
0.000625 + -0.05x + x2 = 5.000625

Factor a perfect square on the left side:
(x + -0.025)(x + -0.025) = 5.000625

Calculate the square root of the right side: 2.236207727

Break this problem into two subproblems by setting 
(x + -0.025) equal to 2.236207727 and -2.236207727.

Subproblem 1

x + -0.025 = 2.236207727 Simplifying x + -0.025 = 2.236207727 Reorder the terms: -0.025 + x = 2.236207727 Solving -0.025 + x = 2.236207727 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.025' to each side of the equation. -0.025 + 0.025 + x = 2.236207727 + 0.025 Combine like terms: -0.025 + 0.025 = 0.000 0.000 + x = 2.236207727 + 0.025 x = 2.236207727 + 0.025 Combine like terms: 2.236207727 + 0.025 = 2.261207727 x = 2.261207727 Simplifying x = 2.261207727

Subproblem 2

x + -0.025 = -2.236207727 Simplifying x + -0.025 = -2.236207727 Reorder the terms: -0.025 + x = -2.236207727 Solving -0.025 + x = -2.236207727 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.025' to each side of the equation. -0.025 + 0.025 + x = -2.236207727 + 0.025 Combine like terms: -0.025 + 0.025 = 0.000 0.000 + x = -2.236207727 + 0.025 x = -2.236207727 + 0.025 Combine like terms: -2.236207727 + 0.025 = -2.211207727 x = -2.211207727 Simplifying x = -2.211207727

Solution

The solution to the problem is based on the solutions from the subproblems. x = {2.261207727, -2.211207727}

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