x^2-2.05x-1=0

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Solution for x^2-2.05x-1=0 equation:


Simplifying
x2 + -2.05x + -1 = 0

Reorder the terms:
-1 + -2.05x + x2 = 0

Solving
-1 + -2.05x + x2 = 0

Solving for variable 'x'.

Begin completing the square.

Move the constant term to the right:

Add '1' to each side of the equation.
-1 + -2.05x + 1 + x2 = 0 + 1

Reorder the terms:
-1 + 1 + -2.05x + x2 = 0 + 1

Combine like terms: -1 + 1 = 0
0 + -2.05x + x2 = 0 + 1
-2.05x + x2 = 0 + 1

Combine like terms: 0 + 1 = 1
-2.05x + x2 = 1

The x term is -2.05x.  Take half its coefficient (-1.025).
Square it (1.050625) and add it to both sides.

Add '1.050625' to each side of the equation.
-2.05x + 1.050625 + x2 = 1 + 1.050625

Reorder the terms:
1.050625 + -2.05x + x2 = 1 + 1.050625

Combine like terms: 1 + 1.050625 = 2.050625
1.050625 + -2.05x + x2 = 2.050625

Factor a perfect square on the left side:
(x + -1.025)(x + -1.025) = 2.050625

Calculate the square root of the right side: 1.432000349

Break this problem into two subproblems by setting 
(x + -1.025) equal to 1.432000349 and -1.432000349.

Subproblem 1

x + -1.025 = 1.432000349 Simplifying x + -1.025 = 1.432000349 Reorder the terms: -1.025 + x = 1.432000349 Solving -1.025 + x = 1.432000349 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.025' to each side of the equation. -1.025 + 1.025 + x = 1.432000349 + 1.025 Combine like terms: -1.025 + 1.025 = 0.000 0.000 + x = 1.432000349 + 1.025 x = 1.432000349 + 1.025 Combine like terms: 1.432000349 + 1.025 = 2.457000349 x = 2.457000349 Simplifying x = 2.457000349

Subproblem 2

x + -1.025 = -1.432000349 Simplifying x + -1.025 = -1.432000349 Reorder the terms: -1.025 + x = -1.432000349 Solving -1.025 + x = -1.432000349 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.025' to each side of the equation. -1.025 + 1.025 + x = -1.432000349 + 1.025 Combine like terms: -1.025 + 1.025 = 0.000 0.000 + x = -1.432000349 + 1.025 x = -1.432000349 + 1.025 Combine like terms: -1.432000349 + 1.025 = -0.407000349 x = -0.407000349 Simplifying x = -0.407000349

Solution

The solution to the problem is based on the solutions from the subproblems. x = {2.457000349, -0.407000349}

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