-x^2-80x+1125=0

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Solution for -x^2-80x+1125=0 equation:


Simplifying
-1x2 + -80x + 1125 = 0

Reorder the terms:
1125 + -80x + -1x2 = 0

Solving
1125 + -80x + -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'.
-1125 + 80x + x2 = 0

Move the constant term to the right:

Add '1125' to each side of the equation.
-1125 + 80x + 1125 + x2 = 0 + 1125

Reorder the terms:
-1125 + 1125 + 80x + x2 = 0 + 1125

Combine like terms: -1125 + 1125 = 0
0 + 80x + x2 = 0 + 1125
80x + x2 = 0 + 1125

Combine like terms: 0 + 1125 = 1125
80x + x2 = 1125

The x term is 80x.  Take half its coefficient (40).
Square it (1600) and add it to both sides.

Add '1600' to each side of the equation.
80x + 1600 + x2 = 1125 + 1600

Reorder the terms:
1600 + 80x + x2 = 1125 + 1600

Combine like terms: 1125 + 1600 = 2725
1600 + 80x + x2 = 2725

Factor a perfect square on the left side:
(x + 40)(x + 40) = 2725

Calculate the square root of the right side: 52.201532545

Break this problem into two subproblems by setting 
(x + 40) equal to 52.201532545 and -52.201532545.

Subproblem 1

x + 40 = 52.201532545 Simplifying x + 40 = 52.201532545 Reorder the terms: 40 + x = 52.201532545 Solving 40 + x = 52.201532545 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-40' to each side of the equation. 40 + -40 + x = 52.201532545 + -40 Combine like terms: 40 + -40 = 0 0 + x = 52.201532545 + -40 x = 52.201532545 + -40 Combine like terms: 52.201532545 + -40 = 12.201532545 x = 12.201532545 Simplifying x = 12.201532545

Subproblem 2

x + 40 = -52.201532545 Simplifying x + 40 = -52.201532545 Reorder the terms: 40 + x = -52.201532545 Solving 40 + x = -52.201532545 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-40' to each side of the equation. 40 + -40 + x = -52.201532545 + -40 Combine like terms: 40 + -40 = 0 0 + x = -52.201532545 + -40 x = -52.201532545 + -40 Combine like terms: -52.201532545 + -40 = -92.201532545 x = -92.201532545 Simplifying x = -92.201532545

Solution

The solution to the problem is based on the solutions from the subproblems. x = {12.201532545, -92.201532545}

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