x^2-9x=25

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Solution for x^2-9x=25 equation:


Simplifying
x2 + -9x = 25

Reorder the terms:
-9x + x2 = 25

Solving
-9x + x2 = 25

Solving for variable 'x'.

Reorder the terms:
-25 + -9x + x2 = 25 + -25

Combine like terms: 25 + -25 = 0
-25 + -9x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '25' to each side of the equation.
-25 + -9x + 25 + x2 = 0 + 25

Reorder the terms:
-25 + 25 + -9x + x2 = 0 + 25

Combine like terms: -25 + 25 = 0
0 + -9x + x2 = 0 + 25
-9x + x2 = 0 + 25

Combine like terms: 0 + 25 = 25
-9x + x2 = 25

The x term is -9x.  Take half its coefficient (-4.5).
Square it (20.25) and add it to both sides.

Add '20.25' to each side of the equation.
-9x + 20.25 + x2 = 25 + 20.25

Reorder the terms:
20.25 + -9x + x2 = 25 + 20.25

Combine like terms: 25 + 20.25 = 45.25
20.25 + -9x + x2 = 45.25

Factor a perfect square on the left side:
(x + -4.5)(x + -4.5) = 45.25

Calculate the square root of the right side: 6.726812024

Break this problem into two subproblems by setting 
(x + -4.5) equal to 6.726812024 and -6.726812024.

Subproblem 1

x + -4.5 = 6.726812024 Simplifying x + -4.5 = 6.726812024 Reorder the terms: -4.5 + x = 6.726812024 Solving -4.5 + x = 6.726812024 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '4.5' to each side of the equation. -4.5 + 4.5 + x = 6.726812024 + 4.5 Combine like terms: -4.5 + 4.5 = 0.0 0.0 + x = 6.726812024 + 4.5 x = 6.726812024 + 4.5 Combine like terms: 6.726812024 + 4.5 = 11.226812024 x = 11.226812024 Simplifying x = 11.226812024

Subproblem 2

x + -4.5 = -6.726812024 Simplifying x + -4.5 = -6.726812024 Reorder the terms: -4.5 + x = -6.726812024 Solving -4.5 + x = -6.726812024 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '4.5' to each side of the equation. -4.5 + 4.5 + x = -6.726812024 + 4.5 Combine like terms: -4.5 + 4.5 = 0.0 0.0 + x = -6.726812024 + 4.5 x = -6.726812024 + 4.5 Combine like terms: -6.726812024 + 4.5 = -2.226812024 x = -2.226812024 Simplifying x = -2.226812024

Solution

The solution to the problem is based on the solutions from the subproblems. x = {11.226812024, -2.226812024}

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