1100=-.2x^2+140x-3000

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Solution for 1100=-.2x^2+140x-3000 equation:


Simplifying
1100 = -0.2x2 + 140x + -3000

Reorder the terms:
1100 = -3000 + 140x + -0.2x2

Solving
1100 = -3000 + 140x + -0.2x2

Solving for variable 'x'.

Combine like terms: 1100 + 3000 = 4100
4100 + -140x + 0.2x2 = -3000 + 140x + -0.2x2 + 3000 + -140x + 0.2x2

Reorder the terms:
4100 + -140x + 0.2x2 = -3000 + 3000 + 140x + -140x + -0.2x2 + 0.2x2

Combine like terms: -3000 + 3000 = 0
4100 + -140x + 0.2x2 = 0 + 140x + -140x + -0.2x2 + 0.2x2
4100 + -140x + 0.2x2 = 140x + -140x + -0.2x2 + 0.2x2

Combine like terms: 140x + -140x = 0
4100 + -140x + 0.2x2 = 0 + -0.2x2 + 0.2x2
4100 + -140x + 0.2x2 = -0.2x2 + 0.2x2

Combine like terms: -0.2x2 + 0.2x2 = 0.0
4100 + -140x + 0.2x2 = 0.0

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

Divide each side by '0.2'.
20500 + -700x + x2 = 0

Move the constant term to the right:

Add '-20500' to each side of the equation.
20500 + -700x + -20500 + x2 = 0 + -20500

Reorder the terms:
20500 + -20500 + -700x + x2 = 0 + -20500

Combine like terms: 20500 + -20500 = 0
0 + -700x + x2 = 0 + -20500
-700x + x2 = 0 + -20500

Combine like terms: 0 + -20500 = -20500
-700x + x2 = -20500

The x term is -700x.  Take half its coefficient (-350).
Square it (122500) and add it to both sides.

Add '122500' to each side of the equation.
-700x + 122500 + x2 = -20500 + 122500

Reorder the terms:
122500 + -700x + x2 = -20500 + 122500

Combine like terms: -20500 + 122500 = 102000
122500 + -700x + x2 = 102000

Factor a perfect square on the left side:
(x + -350)(x + -350) = 102000

Calculate the square root of the right side: 319.374388453

Break this problem into two subproblems by setting 
(x + -350) equal to 319.374388453 and -319.374388453.

Subproblem 1

x + -350 = 319.374388453 Simplifying x + -350 = 319.374388453 Reorder the terms: -350 + x = 319.374388453 Solving -350 + x = 319.374388453 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '350' to each side of the equation. -350 + 350 + x = 319.374388453 + 350 Combine like terms: -350 + 350 = 0 0 + x = 319.374388453 + 350 x = 319.374388453 + 350 Combine like terms: 319.374388453 + 350 = 669.374388453 x = 669.374388453 Simplifying x = 669.374388453

Subproblem 2

x + -350 = -319.374388453 Simplifying x + -350 = -319.374388453 Reorder the terms: -350 + x = -319.374388453 Solving -350 + x = -319.374388453 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '350' to each side of the equation. -350 + 350 + x = -319.374388453 + 350 Combine like terms: -350 + 350 = 0 0 + x = -319.374388453 + 350 x = -319.374388453 + 350 Combine like terms: -319.374388453 + 350 = 30.625611547 x = 30.625611547 Simplifying x = 30.625611547

Solution

The solution to the problem is based on the solutions from the subproblems. x = {669.374388453, 30.625611547}

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