2x^2-x-72=0

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Solution for 2x^2-x-72=0 equation:


Simplifying
2x2 + -1x + -72 = 0

Reorder the terms:
-72 + -1x + 2x2 = 0

Solving
-72 + -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'.
-36 + -0.5x + x2 = 0

Move the constant term to the right:

Add '36' to each side of the equation.
-36 + -0.5x + 36 + x2 = 0 + 36

Reorder the terms:
-36 + 36 + -0.5x + x2 = 0 + 36

Combine like terms: -36 + 36 = 0
0 + -0.5x + x2 = 0 + 36
-0.5x + x2 = 0 + 36

Combine like terms: 0 + 36 = 36
-0.5x + x2 = 36

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 = 36 + 0.0625

Reorder the terms:
0.0625 + -0.5x + x2 = 36 + 0.0625

Combine like terms: 36 + 0.0625 = 36.0625
0.0625 + -0.5x + x2 = 36.0625

Factor a perfect square on the left side:
(x + -0.25)(x + -0.25) = 36.0625

Calculate the square root of the right side: 6.005206075

Break this problem into two subproblems by setting 
(x + -0.25) equal to 6.005206075 and -6.005206075.

Subproblem 1

x + -0.25 = 6.005206075 Simplifying x + -0.25 = 6.005206075 Reorder the terms: -0.25 + x = 6.005206075 Solving -0.25 + x = 6.005206075 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 = 6.005206075 + 0.25 Combine like terms: -0.25 + 0.25 = 0.00 0.00 + x = 6.005206075 + 0.25 x = 6.005206075 + 0.25 Combine like terms: 6.005206075 + 0.25 = 6.255206075 x = 6.255206075 Simplifying x = 6.255206075

Subproblem 2

x + -0.25 = -6.005206075 Simplifying x + -0.25 = -6.005206075 Reorder the terms: -0.25 + x = -6.005206075 Solving -0.25 + x = -6.005206075 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 = -6.005206075 + 0.25 Combine like terms: -0.25 + 0.25 = 0.00 0.00 + x = -6.005206075 + 0.25 x = -6.005206075 + 0.25 Combine like terms: -6.005206075 + 0.25 = -5.755206075 x = -5.755206075 Simplifying x = -5.755206075

Solution

The solution to the problem is based on the solutions from the subproblems. x = {6.255206075, -5.755206075}

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