0=-x^2+100x+1000

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Solution for 0=-x^2+100x+1000 equation:


Simplifying
0 = -1x2 + 100x + 1000

Reorder the terms:
0 = 1000 + 100x + -1x2

Solving
0 = 1000 + 100x + -1x2

Solving for variable 'x'.

Combine like terms: 0 + -1000 = -1000
-1000 + -100x + x2 = 1000 + 100x + -1x2 + -1000 + -100x + x2

Reorder the terms:
-1000 + -100x + x2 = 1000 + -1000 + 100x + -100x + -1x2 + x2

Combine like terms: 1000 + -1000 = 0
-1000 + -100x + x2 = 0 + 100x + -100x + -1x2 + x2
-1000 + -100x + x2 = 100x + -100x + -1x2 + x2

Combine like terms: 100x + -100x = 0
-1000 + -100x + x2 = 0 + -1x2 + x2
-1000 + -100x + x2 = -1x2 + x2

Combine like terms: -1x2 + x2 = 0
-1000 + -100x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '1000' to each side of the equation.
-1000 + -100x + 1000 + x2 = 0 + 1000

Reorder the terms:
-1000 + 1000 + -100x + x2 = 0 + 1000

Combine like terms: -1000 + 1000 = 0
0 + -100x + x2 = 0 + 1000
-100x + x2 = 0 + 1000

Combine like terms: 0 + 1000 = 1000
-100x + x2 = 1000

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 = 1000 + 2500

Reorder the terms:
2500 + -100x + x2 = 1000 + 2500

Combine like terms: 1000 + 2500 = 3500
2500 + -100x + x2 = 3500

Factor a perfect square on the left side:
(x + -50)(x + -50) = 3500

Calculate the square root of the right side: 59.160797831

Break this problem into two subproblems by setting 
(x + -50) equal to 59.160797831 and -59.160797831.

Subproblem 1

x + -50 = 59.160797831 Simplifying x + -50 = 59.160797831 Reorder the terms: -50 + x = 59.160797831 Solving -50 + x = 59.160797831 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 = 59.160797831 + 50 Combine like terms: -50 + 50 = 0 0 + x = 59.160797831 + 50 x = 59.160797831 + 50 Combine like terms: 59.160797831 + 50 = 109.160797831 x = 109.160797831 Simplifying x = 109.160797831

Subproblem 2

x + -50 = -59.160797831 Simplifying x + -50 = -59.160797831 Reorder the terms: -50 + x = -59.160797831 Solving -50 + x = -59.160797831 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 = -59.160797831 + 50 Combine like terms: -50 + 50 = 0 0 + x = -59.160797831 + 50 x = -59.160797831 + 50 Combine like terms: -59.160797831 + 50 = -9.160797831 x = -9.160797831 Simplifying x = -9.160797831

Solution

The solution to the problem is based on the solutions from the subproblems. x = {109.160797831, -9.160797831}

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