x^2-25x+72=0

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Solution for x^2-25x+72=0 equation:


Simplifying
x2 + -25x + 72 = 0

Reorder the terms:
72 + -25x + x2 = 0

Solving
72 + -25x + x2 = 0

Solving for variable 'x'.

Begin completing the square.

Move the constant term to the right:

Add '-72' to each side of the equation.
72 + -25x + -72 + x2 = 0 + -72

Reorder the terms:
72 + -72 + -25x + x2 = 0 + -72

Combine like terms: 72 + -72 = 0
0 + -25x + x2 = 0 + -72
-25x + x2 = 0 + -72

Combine like terms: 0 + -72 = -72
-25x + x2 = -72

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 = -72 + 156.25

Reorder the terms:
156.25 + -25x + x2 = -72 + 156.25

Combine like terms: -72 + 156.25 = 84.25
156.25 + -25x + x2 = 84.25

Factor a perfect square on the left side:
(x + -12.5)(x + -12.5) = 84.25

Calculate the square root of the right side: 9.178779875

Break this problem into two subproblems by setting 
(x + -12.5) equal to 9.178779875 and -9.178779875.

Subproblem 1

x + -12.5 = 9.178779875 Simplifying x + -12.5 = 9.178779875 Reorder the terms: -12.5 + x = 9.178779875 Solving -12.5 + x = 9.178779875 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 = 9.178779875 + 12.5 Combine like terms: -12.5 + 12.5 = 0.0 0.0 + x = 9.178779875 + 12.5 x = 9.178779875 + 12.5 Combine like terms: 9.178779875 + 12.5 = 21.678779875 x = 21.678779875 Simplifying x = 21.678779875

Subproblem 2

x + -12.5 = -9.178779875 Simplifying x + -12.5 = -9.178779875 Reorder the terms: -12.5 + x = -9.178779875 Solving -12.5 + x = -9.178779875 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 = -9.178779875 + 12.5 Combine like terms: -12.5 + 12.5 = 0.0 0.0 + x = -9.178779875 + 12.5 x = -9.178779875 + 12.5 Combine like terms: -9.178779875 + 12.5 = 3.321220125 x = 3.321220125 Simplifying x = 3.321220125

Solution

The solution to the problem is based on the solutions from the subproblems. x = {21.678779875, 3.321220125}

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