2x^2-1x-80=0

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Solution for 2x^2-1x-80=0 equation:


Simplifying
2x2 + -1x + -80 = 0

Reorder the terms:
-80 + -1x + 2x2 = 0

Solving
-80 + -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'.
-40 + -0.5x + x2 = 0

Move the constant term to the right:

Add '40' to each side of the equation.
-40 + -0.5x + 40 + x2 = 0 + 40

Reorder the terms:
-40 + 40 + -0.5x + x2 = 0 + 40

Combine like terms: -40 + 40 = 0
0 + -0.5x + x2 = 0 + 40
-0.5x + x2 = 0 + 40

Combine like terms: 0 + 40 = 40
-0.5x + x2 = 40

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 = 40 + 0.0625

Reorder the terms:
0.0625 + -0.5x + x2 = 40 + 0.0625

Combine like terms: 40 + 0.0625 = 40.0625
0.0625 + -0.5x + x2 = 40.0625

Factor a perfect square on the left side:
(x + -0.25)(x + -0.25) = 40.0625

Calculate the square root of the right side: 6.329494451

Break this problem into two subproblems by setting 
(x + -0.25) equal to 6.329494451 and -6.329494451.

Subproblem 1

x + -0.25 = 6.329494451 Simplifying x + -0.25 = 6.329494451 Reorder the terms: -0.25 + x = 6.329494451 Solving -0.25 + x = 6.329494451 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 = 6.329494451 + 0.25 Combine like terms: -0.25 + 0.25 = 0.00 0.00 + x = 6.329494451 + 0.25 x = 6.329494451 + 0.25 Combine like terms: 6.329494451 + 0.25 = 6.579494451 x = 6.579494451 Simplifying x = 6.579494451

Subproblem 2

x + -0.25 = -6.329494451 Simplifying x + -0.25 = -6.329494451 Reorder the terms: -0.25 + x = -6.329494451 Solving -0.25 + x = -6.329494451 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 = -6.329494451 + 0.25 Combine like terms: -0.25 + 0.25 = 0.00 0.00 + x = -6.329494451 + 0.25 x = -6.329494451 + 0.25 Combine like terms: -6.329494451 + 0.25 = -6.079494451 x = -6.079494451 Simplifying x = -6.079494451

Solution

The solution to the problem is based on the solutions from the subproblems. x = {6.579494451, -6.079494451}

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