x^2-20x-3=0

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


Simplifying
x2 + -20x + -3 = 0

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

Solving
-3 + -20x + x2 = 0

Solving for variable 'x'.

Begin completing the square.

Move the constant term to the right:

Add '3' to each side of the equation.
-3 + -20x + 3 + x2 = 0 + 3

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

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

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

The x term is -20x.  Take half its coefficient (-10).
Square it (100) and add it to both sides.

Add '100' to each side of the equation.
-20x + 100 + x2 = 3 + 100

Reorder the terms:
100 + -20x + x2 = 3 + 100

Combine like terms: 3 + 100 = 103
100 + -20x + x2 = 103

Factor a perfect square on the left side:
(x + -10)(x + -10) = 103

Calculate the square root of the right side: 10.148891565

Break this problem into two subproblems by setting 
(x + -10) equal to 10.148891565 and -10.148891565.

Subproblem 1

x + -10 = 10.148891565 Simplifying x + -10 = 10.148891565 Reorder the terms: -10 + x = 10.148891565 Solving -10 + x = 10.148891565 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '10' to each side of the equation. -10 + 10 + x = 10.148891565 + 10 Combine like terms: -10 + 10 = 0 0 + x = 10.148891565 + 10 x = 10.148891565 + 10 Combine like terms: 10.148891565 + 10 = 20.148891565 x = 20.148891565 Simplifying x = 20.148891565

Subproblem 2

x + -10 = -10.148891565 Simplifying x + -10 = -10.148891565 Reorder the terms: -10 + x = -10.148891565 Solving -10 + x = -10.148891565 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '10' to each side of the equation. -10 + 10 + x = -10.148891565 + 10 Combine like terms: -10 + 10 = 0 0 + x = -10.148891565 + 10 x = -10.148891565 + 10 Combine like terms: -10.148891565 + 10 = -0.148891565 x = -0.148891565 Simplifying x = -0.148891565

Solution

The solution to the problem is based on the solutions from the subproblems. x = {20.148891565, -0.148891565}

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