0=x^2+615x-81000

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Solution for 0=x^2+615x-81000 equation:


Simplifying
0 = x2 + 615x + -81000

Reorder the terms:
0 = -81000 + 615x + x2

Solving
0 = -81000 + 615x + x2

Solving for variable 'x'.

Combine like terms: 0 + 81000 = 81000
81000 + -615x + -1x2 = -81000 + 615x + x2 + 81000 + -615x + -1x2

Reorder the terms:
81000 + -615x + -1x2 = -81000 + 81000 + 615x + -615x + x2 + -1x2

Combine like terms: -81000 + 81000 = 0
81000 + -615x + -1x2 = 0 + 615x + -615x + x2 + -1x2
81000 + -615x + -1x2 = 615x + -615x + x2 + -1x2

Combine like terms: 615x + -615x = 0
81000 + -615x + -1x2 = 0 + x2 + -1x2
81000 + -615x + -1x2 = x2 + -1x2

Combine like terms: x2 + -1x2 = 0
81000 + -615x + -1x2 = 0

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

Divide each side by '-1'.
-81000 + 615x + x2 = 0

Move the constant term to the right:

Add '81000' to each side of the equation.
-81000 + 615x + 81000 + x2 = 0 + 81000

Reorder the terms:
-81000 + 81000 + 615x + x2 = 0 + 81000

Combine like terms: -81000 + 81000 = 0
0 + 615x + x2 = 0 + 81000
615x + x2 = 0 + 81000

Combine like terms: 0 + 81000 = 81000
615x + x2 = 81000

The x term is 615x.  Take half its coefficient (307.5).
Square it (94556.25) and add it to both sides.

Add '94556.25' to each side of the equation.
615x + 94556.25 + x2 = 81000 + 94556.25

Reorder the terms:
94556.25 + 615x + x2 = 81000 + 94556.25

Combine like terms: 81000 + 94556.25 = 175556.25
94556.25 + 615x + x2 = 175556.25

Factor a perfect square on the left side:
(x + 307.5)(x + 307.5) = 175556.25

Calculate the square root of the right side: 418.994331704

Break this problem into two subproblems by setting 
(x + 307.5) equal to 418.994331704 and -418.994331704.

Subproblem 1

x + 307.5 = 418.994331704 Simplifying x + 307.5 = 418.994331704 Reorder the terms: 307.5 + x = 418.994331704 Solving 307.5 + x = 418.994331704 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-307.5' to each side of the equation. 307.5 + -307.5 + x = 418.994331704 + -307.5 Combine like terms: 307.5 + -307.5 = 0.0 0.0 + x = 418.994331704 + -307.5 x = 418.994331704 + -307.5 Combine like terms: 418.994331704 + -307.5 = 111.494331704 x = 111.494331704 Simplifying x = 111.494331704

Subproblem 2

x + 307.5 = -418.994331704 Simplifying x + 307.5 = -418.994331704 Reorder the terms: 307.5 + x = -418.994331704 Solving 307.5 + x = -418.994331704 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-307.5' to each side of the equation. 307.5 + -307.5 + x = -418.994331704 + -307.5 Combine like terms: 307.5 + -307.5 = 0.0 0.0 + x = -418.994331704 + -307.5 x = -418.994331704 + -307.5 Combine like terms: -418.994331704 + -307.5 = -726.494331704 x = -726.494331704 Simplifying x = -726.494331704

Solution

The solution to the problem is based on the solutions from the subproblems. x = {111.494331704, -726.494331704}

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