0.2x^2-9x-1000=0

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Solution for 0.2x^2-9x-1000=0 equation:


Simplifying
0.2x2 + -9x + -1000 = 0

Reorder the terms:
-1000 + -9x + 0.2x2 = 0

Solving
-1000 + -9x + 0.2x2 = 0

Solving for variable 'x'.

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

Divide each side by '0.2'.
-5000 + -45x + x2 = 0

Move the constant term to the right:

Add '5000' to each side of the equation.
-5000 + -45x + 5000 + x2 = 0 + 5000

Reorder the terms:
-5000 + 5000 + -45x + x2 = 0 + 5000

Combine like terms: -5000 + 5000 = 0
0 + -45x + x2 = 0 + 5000
-45x + x2 = 0 + 5000

Combine like terms: 0 + 5000 = 5000
-45x + x2 = 5000

The x term is -45x.  Take half its coefficient (-22.5).
Square it (506.25) and add it to both sides.

Add '506.25' to each side of the equation.
-45x + 506.25 + x2 = 5000 + 506.25

Reorder the terms:
506.25 + -45x + x2 = 5000 + 506.25

Combine like terms: 5000 + 506.25 = 5506.25
506.25 + -45x + x2 = 5506.25

Factor a perfect square on the left side:
(x + -22.5)(x + -22.5) = 5506.25

Calculate the square root of the right side: 74.204110398

Break this problem into two subproblems by setting 
(x + -22.5) equal to 74.204110398 and -74.204110398.

Subproblem 1

x + -22.5 = 74.204110398 Simplifying x + -22.5 = 74.204110398 Reorder the terms: -22.5 + x = 74.204110398 Solving -22.5 + x = 74.204110398 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '22.5' to each side of the equation. -22.5 + 22.5 + x = 74.204110398 + 22.5 Combine like terms: -22.5 + 22.5 = 0.0 0.0 + x = 74.204110398 + 22.5 x = 74.204110398 + 22.5 Combine like terms: 74.204110398 + 22.5 = 96.704110398 x = 96.704110398 Simplifying x = 96.704110398

Subproblem 2

x + -22.5 = -74.204110398 Simplifying x + -22.5 = -74.204110398 Reorder the terms: -22.5 + x = -74.204110398 Solving -22.5 + x = -74.204110398 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '22.5' to each side of the equation. -22.5 + 22.5 + x = -74.204110398 + 22.5 Combine like terms: -22.5 + 22.5 = 0.0 0.0 + x = -74.204110398 + 22.5 x = -74.204110398 + 22.5 Combine like terms: -74.204110398 + 22.5 = -51.704110398 x = -51.704110398 Simplifying x = -51.704110398

Solution

The solution to the problem is based on the solutions from the subproblems. x = {96.704110398, -51.704110398}

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