2x^2-x-180=0

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Solution for 2x^2-x-180=0 equation:


Simplifying
2x2 + -1x + -180 = 0

Reorder the terms:
-180 + -1x + 2x2 = 0

Solving
-180 + -1x + 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'.
-90 + -0.5x + x2 = 0

Move the constant term to the right:

Add '90' to each side of the equation.
-90 + -0.5x + 90 + x2 = 0 + 90

Reorder the terms:
-90 + 90 + -0.5x + x2 = 0 + 90

Combine like terms: -90 + 90 = 0
0 + -0.5x + x2 = 0 + 90
-0.5x + x2 = 0 + 90

Combine like terms: 0 + 90 = 90
-0.5x + x2 = 90

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 = 90 + 0.0625

Reorder the terms:
0.0625 + -0.5x + x2 = 90 + 0.0625

Combine like terms: 90 + 0.0625 = 90.0625
0.0625 + -0.5x + x2 = 90.0625

Factor a perfect square on the left side:
(x + -0.25)(x + -0.25) = 90.0625

Calculate the square root of the right side: 9.490126448

Break this problem into two subproblems by setting 
(x + -0.25) equal to 9.490126448 and -9.490126448.

Subproblem 1

x + -0.25 = 9.490126448 Simplifying x + -0.25 = 9.490126448 Reorder the terms: -0.25 + x = 9.490126448 Solving -0.25 + x = 9.490126448 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 = 9.490126448 + 0.25 Combine like terms: -0.25 + 0.25 = 0.00 0.00 + x = 9.490126448 + 0.25 x = 9.490126448 + 0.25 Combine like terms: 9.490126448 + 0.25 = 9.740126448 x = 9.740126448 Simplifying x = 9.740126448

Subproblem 2

x + -0.25 = -9.490126448 Simplifying x + -0.25 = -9.490126448 Reorder the terms: -0.25 + x = -9.490126448 Solving -0.25 + x = -9.490126448 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 = -9.490126448 + 0.25 Combine like terms: -0.25 + 0.25 = 0.00 0.00 + x = -9.490126448 + 0.25 x = -9.490126448 + 0.25 Combine like terms: -9.490126448 + 0.25 = -9.240126448 x = -9.240126448 Simplifying x = -9.240126448

Solution

The solution to the problem is based on the solutions from the subproblems. x = {9.740126448, -9.240126448}

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