2x^2-x-1=105

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Solution for 2x^2-x-1=105 equation:


Simplifying
2x2 + -1x + -1 = 105

Reorder the terms:
-1 + -1x + 2x2 = 105

Solving
-1 + -1x + 2x2 = 105

Solving for variable 'x'.

Reorder the terms:
-1 + -105 + -1x + 2x2 = 105 + -105

Combine like terms: -1 + -105 = -106
-106 + -1x + 2x2 = 105 + -105

Combine like terms: 105 + -105 = 0
-106 + -1x + 2x2 = 0

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

Divide each side by '2'.
-53 + -0.5x + x2 = 0

Move the constant term to the right:

Add '53' to each side of the equation.
-53 + -0.5x + 53 + x2 = 0 + 53

Reorder the terms:
-53 + 53 + -0.5x + x2 = 0 + 53

Combine like terms: -53 + 53 = 0
0 + -0.5x + x2 = 0 + 53
-0.5x + x2 = 0 + 53

Combine like terms: 0 + 53 = 53
-0.5x + x2 = 53

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 = 53 + 0.0625

Reorder the terms:
0.0625 + -0.5x + x2 = 53 + 0.0625

Combine like terms: 53 + 0.0625 = 53.0625
0.0625 + -0.5x + x2 = 53.0625

Factor a perfect square on the left side:
(x + -0.25)(x + -0.25) = 53.0625

Calculate the square root of the right side: 7.284401142

Break this problem into two subproblems by setting 
(x + -0.25) equal to 7.284401142 and -7.284401142.

Subproblem 1

x + -0.25 = 7.284401142 Simplifying x + -0.25 = 7.284401142 Reorder the terms: -0.25 + x = 7.284401142 Solving -0.25 + x = 7.284401142 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 = 7.284401142 + 0.25 Combine like terms: -0.25 + 0.25 = 0.00 0.00 + x = 7.284401142 + 0.25 x = 7.284401142 + 0.25 Combine like terms: 7.284401142 + 0.25 = 7.534401142 x = 7.534401142 Simplifying x = 7.534401142

Subproblem 2

x + -0.25 = -7.284401142 Simplifying x + -0.25 = -7.284401142 Reorder the terms: -0.25 + x = -7.284401142 Solving -0.25 + x = -7.284401142 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 = -7.284401142 + 0.25 Combine like terms: -0.25 + 0.25 = 0.00 0.00 + x = -7.284401142 + 0.25 x = -7.284401142 + 0.25 Combine like terms: -7.284401142 + 0.25 = -7.034401142 x = -7.034401142 Simplifying x = -7.034401142

Solution

The solution to the problem is based on the solutions from the subproblems. x = {7.534401142, -7.034401142}

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