2x^2+x-41=0

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Solution for 2x^2+x-41=0 equation:


Simplifying
2x2 + x + -41 = 0

Reorder the terms:
-41 + x + 2x2 = 0

Solving
-41 + x + 2x2 = 0

Solving for variable 'x'.

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

Divide each side by '2'.
-20.5 + 0.5x + x2 = 0

Move the constant term to the right:

Add '20.5' to each side of the equation.
-20.5 + 0.5x + 20.5 + x2 = 0 + 20.5

Reorder the terms:
-20.5 + 20.5 + 0.5x + x2 = 0 + 20.5

Combine like terms: -20.5 + 20.5 = 0.0
0.0 + 0.5x + x2 = 0 + 20.5
0.5x + x2 = 0 + 20.5

Combine like terms: 0 + 20.5 = 20.5
0.5x + x2 = 20.5

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.
0.5x + 0.25 + x2 = 20.5 + 0.25

Reorder the terms:
0.25 + 0.5x + x2 = 20.5 + 0.25

Combine like terms: 20.5 + 0.25 = 20.75
0.25 + 0.5x + x2 = 20.75

Factor a perfect square on the left side:
(x + 0.5)(x + 0.5) = 20.75

Calculate the square root of the right side: 4.55521679

Break this problem into two subproblems by setting 
(x + 0.5) equal to 4.55521679 and -4.55521679.

Subproblem 1

x + 0.5 = 4.55521679 Simplifying x + 0.5 = 4.55521679 Reorder the terms: 0.5 + x = 4.55521679 Solving 0.5 + x = 4.55521679 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 = 4.55521679 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + x = 4.55521679 + -0.5 x = 4.55521679 + -0.5 Combine like terms: 4.55521679 + -0.5 = 4.05521679 x = 4.05521679 Simplifying x = 4.05521679

Subproblem 2

x + 0.5 = -4.55521679 Simplifying x + 0.5 = -4.55521679 Reorder the terms: 0.5 + x = -4.55521679 Solving 0.5 + x = -4.55521679 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 = -4.55521679 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + x = -4.55521679 + -0.5 x = -4.55521679 + -0.5 Combine like terms: -4.55521679 + -0.5 = -5.05521679 x = -5.05521679 Simplifying x = -5.05521679

Solution

The solution to the problem is based on the solutions from the subproblems. x = {4.05521679, -5.05521679}

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