x^2-3+9x-27=0

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Solution for x^2-3+9x-27=0 equation:


Simplifying
x2 + -3 + 9x + -27 = 0

Reorder the terms:
-3 + -27 + 9x + x2 = 0

Combine like terms: -3 + -27 = -30
-30 + 9x + x2 = 0

Solving
-30 + 9x + x2 = 0

Solving for variable 'x'.

Begin completing the square.

Move the constant term to the right:

Add '30' to each side of the equation.
-30 + 9x + 30 + x2 = 0 + 30

Reorder the terms:
-30 + 30 + 9x + x2 = 0 + 30

Combine like terms: -30 + 30 = 0
0 + 9x + x2 = 0 + 30
9x + x2 = 0 + 30

Combine like terms: 0 + 30 = 30
9x + x2 = 30

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 = 30 + 20.25

Reorder the terms:
20.25 + 9x + x2 = 30 + 20.25

Combine like terms: 30 + 20.25 = 50.25
20.25 + 9x + x2 = 50.25

Factor a perfect square on the left side:
(x + 4.5)(x + 4.5) = 50.25

Calculate the square root of the right side: 7.088723439

Break this problem into two subproblems by setting 
(x + 4.5) equal to 7.088723439 and -7.088723439.

Subproblem 1

x + 4.5 = 7.088723439 Simplifying x + 4.5 = 7.088723439 Reorder the terms: 4.5 + x = 7.088723439 Solving 4.5 + x = 7.088723439 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 = 7.088723439 + -4.5 Combine like terms: 4.5 + -4.5 = 0.0 0.0 + x = 7.088723439 + -4.5 x = 7.088723439 + -4.5 Combine like terms: 7.088723439 + -4.5 = 2.588723439 x = 2.588723439 Simplifying x = 2.588723439

Subproblem 2

x + 4.5 = -7.088723439 Simplifying x + 4.5 = -7.088723439 Reorder the terms: 4.5 + x = -7.088723439 Solving 4.5 + x = -7.088723439 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 = -7.088723439 + -4.5 Combine like terms: 4.5 + -4.5 = 0.0 0.0 + x = -7.088723439 + -4.5 x = -7.088723439 + -4.5 Combine like terms: -7.088723439 + -4.5 = -11.588723439 x = -11.588723439 Simplifying x = -11.588723439

Solution

The solution to the problem is based on the solutions from the subproblems. x = {2.588723439, -11.588723439}

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