3=x^2-9x+1

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Solution for 3=x^2-9x+1 equation:


Simplifying
3 = x2 + -9x + 1

Reorder the terms:
3 = 1 + -9x + x2

Solving
3 = 1 + -9x + x2

Solving for variable 'x'.

Combine like terms: 3 + -1 = 2
2 + 9x + -1x2 = 1 + -9x + x2 + -1 + 9x + -1x2

Reorder the terms:
2 + 9x + -1x2 = 1 + -1 + -9x + 9x + x2 + -1x2

Combine like terms: 1 + -1 = 0
2 + 9x + -1x2 = 0 + -9x + 9x + x2 + -1x2
2 + 9x + -1x2 = -9x + 9x + x2 + -1x2

Combine like terms: -9x + 9x = 0
2 + 9x + -1x2 = 0 + x2 + -1x2
2 + 9x + -1x2 = x2 + -1x2

Combine like terms: x2 + -1x2 = 0
2 + 9x + -1x2 = 0

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

Divide each side by '-1'.
-2 + -9x + x2 = 0

Move the constant term to the right:

Add '2' to each side of the equation.
-2 + -9x + 2 + x2 = 0 + 2

Reorder the terms:
-2 + 2 + -9x + x2 = 0 + 2

Combine like terms: -2 + 2 = 0
0 + -9x + x2 = 0 + 2
-9x + x2 = 0 + 2

Combine like terms: 0 + 2 = 2
-9x + x2 = 2

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 = 2 + 20.25

Reorder the terms:
20.25 + -9x + x2 = 2 + 20.25

Combine like terms: 2 + 20.25 = 22.25
20.25 + -9x + x2 = 22.25

Factor a perfect square on the left side:
(x + -4.5)(x + -4.5) = 22.25

Calculate the square root of the right side: 4.716990566

Break this problem into two subproblems by setting 
(x + -4.5) equal to 4.716990566 and -4.716990566.

Subproblem 1

x + -4.5 = 4.716990566 Simplifying x + -4.5 = 4.716990566 Reorder the terms: -4.5 + x = 4.716990566 Solving -4.5 + x = 4.716990566 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 = 4.716990566 + 4.5 Combine like terms: -4.5 + 4.5 = 0.0 0.0 + x = 4.716990566 + 4.5 x = 4.716990566 + 4.5 Combine like terms: 4.716990566 + 4.5 = 9.216990566 x = 9.216990566 Simplifying x = 9.216990566

Subproblem 2

x + -4.5 = -4.716990566 Simplifying x + -4.5 = -4.716990566 Reorder the terms: -4.5 + x = -4.716990566 Solving -4.5 + x = -4.716990566 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 = -4.716990566 + 4.5 Combine like terms: -4.5 + 4.5 = 0.0 0.0 + x = -4.716990566 + 4.5 x = -4.716990566 + 4.5 Combine like terms: -4.716990566 + 4.5 = -0.216990566 x = -0.216990566 Simplifying x = -0.216990566

Solution

The solution to the problem is based on the solutions from the subproblems. x = {9.216990566, -0.216990566}

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