-x^2+980x-3000=0

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Solution for -x^2+980x-3000=0 equation:


Simplifying
-1x2 + 980x + -3000 = 0

Reorder the terms:
-3000 + 980x + -1x2 = 0

Solving
-3000 + 980x + -1x2 = 0

Solving for variable 'x'.

Begin completing the square.  Divide all terms by
-1 the coefficient of the squared term: 

Divide each side by '-1'.
3000 + -980x + x2 = 0

Move the constant term to the right:

Add '-3000' to each side of the equation.
3000 + -980x + -3000 + x2 = 0 + -3000

Reorder the terms:
3000 + -3000 + -980x + x2 = 0 + -3000

Combine like terms: 3000 + -3000 = 0
0 + -980x + x2 = 0 + -3000
-980x + x2 = 0 + -3000

Combine like terms: 0 + -3000 = -3000
-980x + x2 = -3000

The x term is -980x.  Take half its coefficient (-490).
Square it (240100) and add it to both sides.

Add '240100' to each side of the equation.
-980x + 240100 + x2 = -3000 + 240100

Reorder the terms:
240100 + -980x + x2 = -3000 + 240100

Combine like terms: -3000 + 240100 = 237100
240100 + -980x + x2 = 237100

Factor a perfect square on the left side:
(x + -490)(x + -490) = 237100

Calculate the square root of the right side: 486.929152958

Break this problem into two subproblems by setting 
(x + -490) equal to 486.929152958 and -486.929152958.

Subproblem 1

x + -490 = 486.929152958 Simplifying x + -490 = 486.929152958 Reorder the terms: -490 + x = 486.929152958 Solving -490 + x = 486.929152958 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '490' to each side of the equation. -490 + 490 + x = 486.929152958 + 490 Combine like terms: -490 + 490 = 0 0 + x = 486.929152958 + 490 x = 486.929152958 + 490 Combine like terms: 486.929152958 + 490 = 976.929152958 x = 976.929152958 Simplifying x = 976.929152958

Subproblem 2

x + -490 = -486.929152958 Simplifying x + -490 = -486.929152958 Reorder the terms: -490 + x = -486.929152958 Solving -490 + x = -486.929152958 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '490' to each side of the equation. -490 + 490 + x = -486.929152958 + 490 Combine like terms: -490 + 490 = 0 0 + x = -486.929152958 + 490 x = -486.929152958 + 490 Combine like terms: -486.929152958 + 490 = 3.070847042 x = 3.070847042 Simplifying x = 3.070847042

Solution

The solution to the problem is based on the solutions from the subproblems. x = {976.929152958, 3.070847042}

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