.9x^2-90x-1000=0

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Solution for .9x^2-90x-1000=0 equation:


Simplifying
0.9x2 + -90x + -1000 = 0

Reorder the terms:
-1000 + -90x + 0.9x2 = 0

Solving
-1000 + -90x + 0.9x2 = 0

Solving for variable 'x'.

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

Divide each side by '0.9'.
-1111.111111 + -100x + x2 = 0

Move the constant term to the right:

Add '1111.111111' to each side of the equation.
-1111.111111 + -100x + 1111.111111 + x2 = 0 + 1111.111111

Reorder the terms:
-1111.111111 + 1111.111111 + -100x + x2 = 0 + 1111.111111

Combine like terms: -1111.111111 + 1111.111111 = 0.000000
0.000000 + -100x + x2 = 0 + 1111.111111
-100x + x2 = 0 + 1111.111111

Combine like terms: 0 + 1111.111111 = 1111.111111
-100x + x2 = 1111.111111

The x term is -100x.  Take half its coefficient (-50).
Square it (2500) and add it to both sides.

Add '2500' to each side of the equation.
-100x + 2500 + x2 = 1111.111111 + 2500

Reorder the terms:
2500 + -100x + x2 = 1111.111111 + 2500

Combine like terms: 1111.111111 + 2500 = 3611.111111
2500 + -100x + x2 = 3611.111111

Factor a perfect square on the left side:
(x + -50)(x + -50) = 3611.111111

Calculate the square root of the right side: 60.092521257

Break this problem into two subproblems by setting 
(x + -50) equal to 60.092521257 and -60.092521257.

Subproblem 1

x + -50 = 60.092521257 Simplifying x + -50 = 60.092521257 Reorder the terms: -50 + x = 60.092521257 Solving -50 + x = 60.092521257 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '50' to each side of the equation. -50 + 50 + x = 60.092521257 + 50 Combine like terms: -50 + 50 = 0 0 + x = 60.092521257 + 50 x = 60.092521257 + 50 Combine like terms: 60.092521257 + 50 = 110.092521257 x = 110.092521257 Simplifying x = 110.092521257

Subproblem 2

x + -50 = -60.092521257 Simplifying x + -50 = -60.092521257 Reorder the terms: -50 + x = -60.092521257 Solving -50 + x = -60.092521257 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '50' to each side of the equation. -50 + 50 + x = -60.092521257 + 50 Combine like terms: -50 + 50 = 0 0 + x = -60.092521257 + 50 x = -60.092521257 + 50 Combine like terms: -60.092521257 + 50 = -10.092521257 x = -10.092521257 Simplifying x = -10.092521257

Solution

The solution to the problem is based on the solutions from the subproblems. x = {110.092521257, -10.092521257}

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