0=x^2+25x-266

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Solution for 0=x^2+25x-266 equation:


Simplifying
0 = x2 + 25x + -266

Reorder the terms:
0 = -266 + 25x + x2

Solving
0 = -266 + 25x + x2

Solving for variable 'x'.

Combine like terms: 0 + 266 = 266
266 + -25x + -1x2 = -266 + 25x + x2 + 266 + -25x + -1x2

Reorder the terms:
266 + -25x + -1x2 = -266 + 266 + 25x + -25x + x2 + -1x2

Combine like terms: -266 + 266 = 0
266 + -25x + -1x2 = 0 + 25x + -25x + x2 + -1x2
266 + -25x + -1x2 = 25x + -25x + x2 + -1x2

Combine like terms: 25x + -25x = 0
266 + -25x + -1x2 = 0 + x2 + -1x2
266 + -25x + -1x2 = x2 + -1x2

Combine like terms: x2 + -1x2 = 0
266 + -25x + -1x2 = 0

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

Divide each side by '-1'.
-266 + 25x + x2 = 0

Move the constant term to the right:

Add '266' to each side of the equation.
-266 + 25x + 266 + x2 = 0 + 266

Reorder the terms:
-266 + 266 + 25x + x2 = 0 + 266

Combine like terms: -266 + 266 = 0
0 + 25x + x2 = 0 + 266
25x + x2 = 0 + 266

Combine like terms: 0 + 266 = 266
25x + x2 = 266

The x term is 25x.  Take half its coefficient (12.5).
Square it (156.25) and add it to both sides.

Add '156.25' to each side of the equation.
25x + 156.25 + x2 = 266 + 156.25

Reorder the terms:
156.25 + 25x + x2 = 266 + 156.25

Combine like terms: 266 + 156.25 = 422.25
156.25 + 25x + x2 = 422.25

Factor a perfect square on the left side:
(x + 12.5)(x + 12.5) = 422.25

Calculate the square root of the right side: 20.548722588

Break this problem into two subproblems by setting 
(x + 12.5) equal to 20.548722588 and -20.548722588.

Subproblem 1

x + 12.5 = 20.548722588 Simplifying x + 12.5 = 20.548722588 Reorder the terms: 12.5 + x = 20.548722588 Solving 12.5 + x = 20.548722588 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-12.5' to each side of the equation. 12.5 + -12.5 + x = 20.548722588 + -12.5 Combine like terms: 12.5 + -12.5 = 0.0 0.0 + x = 20.548722588 + -12.5 x = 20.548722588 + -12.5 Combine like terms: 20.548722588 + -12.5 = 8.048722588 x = 8.048722588 Simplifying x = 8.048722588

Subproblem 2

x + 12.5 = -20.548722588 Simplifying x + 12.5 = -20.548722588 Reorder the terms: 12.5 + x = -20.548722588 Solving 12.5 + x = -20.548722588 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-12.5' to each side of the equation. 12.5 + -12.5 + x = -20.548722588 + -12.5 Combine like terms: 12.5 + -12.5 = 0.0 0.0 + x = -20.548722588 + -12.5 x = -20.548722588 + -12.5 Combine like terms: -20.548722588 + -12.5 = -33.048722588 x = -33.048722588 Simplifying x = -33.048722588

Solution

The solution to the problem is based on the solutions from the subproblems. x = {8.048722588, -33.048722588}

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