2x^2+85x-2000=0

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Solution for 2x^2+85x-2000=0 equation:


Simplifying
2x2 + 85x + -2000 = 0

Reorder the terms:
-2000 + 85x + 2x2 = 0

Solving
-2000 + 85x + 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'.
-1000 + 42.5x + x2 = 0

Move the constant term to the right:

Add '1000' to each side of the equation.
-1000 + 42.5x + 1000 + x2 = 0 + 1000

Reorder the terms:
-1000 + 1000 + 42.5x + x2 = 0 + 1000

Combine like terms: -1000 + 1000 = 0
0 + 42.5x + x2 = 0 + 1000
42.5x + x2 = 0 + 1000

Combine like terms: 0 + 1000 = 1000
42.5x + x2 = 1000

The x term is 42.5x.  Take half its coefficient (21.25).
Square it (451.5625) and add it to both sides.

Add '451.5625' to each side of the equation.
42.5x + 451.5625 + x2 = 1000 + 451.5625

Reorder the terms:
451.5625 + 42.5x + x2 = 1000 + 451.5625

Combine like terms: 1000 + 451.5625 = 1451.5625
451.5625 + 42.5x + x2 = 1451.5625

Factor a perfect square on the left side:
(x + 21.25)(x + 21.25) = 1451.5625

Calculate the square root of the right side: 38.099376635

Break this problem into two subproblems by setting 
(x + 21.25) equal to 38.099376635 and -38.099376635.

Subproblem 1

x + 21.25 = 38.099376635 Simplifying x + 21.25 = 38.099376635 Reorder the terms: 21.25 + x = 38.099376635 Solving 21.25 + x = 38.099376635 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-21.25' to each side of the equation. 21.25 + -21.25 + x = 38.099376635 + -21.25 Combine like terms: 21.25 + -21.25 = 0.00 0.00 + x = 38.099376635 + -21.25 x = 38.099376635 + -21.25 Combine like terms: 38.099376635 + -21.25 = 16.849376635 x = 16.849376635 Simplifying x = 16.849376635

Subproblem 2

x + 21.25 = -38.099376635 Simplifying x + 21.25 = -38.099376635 Reorder the terms: 21.25 + x = -38.099376635 Solving 21.25 + x = -38.099376635 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-21.25' to each side of the equation. 21.25 + -21.25 + x = -38.099376635 + -21.25 Combine like terms: 21.25 + -21.25 = 0.00 0.00 + x = -38.099376635 + -21.25 x = -38.099376635 + -21.25 Combine like terms: -38.099376635 + -21.25 = -59.349376635 x = -59.349376635 Simplifying x = -59.349376635

Solution

The solution to the problem is based on the solutions from the subproblems. x = {16.849376635, -59.349376635}

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