(0.5x^2)+3x-800=0

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Solution for (0.5x^2)+3x-800=0 equation:


Simplifying
(0.5x2) + 3x + -800 = 0

Reorder the terms:
-800 + 3x + (0.5x2) = 0

Solving
-800 + 3x + (0.5x2) = 0

Solving for variable 'x'.

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

Divide each side by '0.5'.
-1600 + 6x + x2 = 0

Move the constant term to the right:

Add '1600' to each side of the equation.
-1600 + 6x + 1600 + x2 = 0 + 1600

Reorder the terms:
-1600 + 1600 + 6x + x2 = 0 + 1600

Combine like terms: -1600 + 1600 = 0
0 + 6x + x2 = 0 + 1600
6x + x2 = 0 + 1600

Combine like terms: 0 + 1600 = 1600
6x + x2 = 1600

The x term is 6x.  Take half its coefficient (3).
Square it (9) and add it to both sides.

Add '9' to each side of the equation.
6x + 9 + x2 = 1600 + 9

Reorder the terms:
9 + 6x + x2 = 1600 + 9

Combine like terms: 1600 + 9 = 1609
9 + 6x + x2 = 1609

Factor a perfect square on the left side:
((x) + 3)((x) + 3) = 1609

Calculate the square root of the right side: 40.11234224

Break this problem into two subproblems by setting 
((x) + 3) equal to 40.11234224 and -40.11234224.

Subproblem 1

(x) + 3 = 40.11234224 Simplifying (x) + 3 = 40.11234224 x + 3 = 40.11234224 Reorder the terms: 3 + x = 40.11234224 Solving 3 + x = 40.11234224 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-3' to each side of the equation. 3 + -3 + x = 40.11234224 + -3 Combine like terms: 3 + -3 = 0 0 + x = 40.11234224 + -3 x = 40.11234224 + -3 Combine like terms: 40.11234224 + -3 = 37.11234224 x = 37.11234224 Simplifying x = 37.11234224

Subproblem 2

(x) + 3 = -40.11234224 Simplifying (x) + 3 = -40.11234224 x + 3 = -40.11234224 Reorder the terms: 3 + x = -40.11234224 Solving 3 + x = -40.11234224 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-3' to each side of the equation. 3 + -3 + x = -40.11234224 + -3 Combine like terms: 3 + -3 = 0 0 + x = -40.11234224 + -3 x = -40.11234224 + -3 Combine like terms: -40.11234224 + -3 = -43.11234224 x = -43.11234224 Simplifying x = -43.11234224

Solution

The solution to the problem is based on the solutions from the subproblems. x = {37.11234224, -43.11234224}

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