x^2-3x=9x-18

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Solution for x^2-3x=9x-18 equation:


Simplifying
x2 + -3x = 9x + -18

Reorder the terms:
-3x + x2 = 9x + -18

Reorder the terms:
-3x + x2 = -18 + 9x

Solving
-3x + x2 = -18 + 9x

Solving for variable 'x'.

Reorder the terms:
18 + -3x + -9x + x2 = -18 + 9x + 18 + -9x

Combine like terms: -3x + -9x = -12x
18 + -12x + x2 = -18 + 9x + 18 + -9x

Reorder the terms:
18 + -12x + x2 = -18 + 18 + 9x + -9x

Combine like terms: -18 + 18 = 0
18 + -12x + x2 = 0 + 9x + -9x
18 + -12x + x2 = 9x + -9x

Combine like terms: 9x + -9x = 0
18 + -12x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '-18' to each side of the equation.
18 + -12x + -18 + x2 = 0 + -18

Reorder the terms:
18 + -18 + -12x + x2 = 0 + -18

Combine like terms: 18 + -18 = 0
0 + -12x + x2 = 0 + -18
-12x + x2 = 0 + -18

Combine like terms: 0 + -18 = -18
-12x + x2 = -18

The x term is -12x.  Take half its coefficient (-6).
Square it (36) and add it to both sides.

Add '36' to each side of the equation.
-12x + 36 + x2 = -18 + 36

Reorder the terms:
36 + -12x + x2 = -18 + 36

Combine like terms: -18 + 36 = 18
36 + -12x + x2 = 18

Factor a perfect square on the left side:
(x + -6)(x + -6) = 18

Calculate the square root of the right side: 4.242640687

Break this problem into two subproblems by setting 
(x + -6) equal to 4.242640687 and -4.242640687.

Subproblem 1

x + -6 = 4.242640687 Simplifying x + -6 = 4.242640687 Reorder the terms: -6 + x = 4.242640687 Solving -6 + x = 4.242640687 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '6' to each side of the equation. -6 + 6 + x = 4.242640687 + 6 Combine like terms: -6 + 6 = 0 0 + x = 4.242640687 + 6 x = 4.242640687 + 6 Combine like terms: 4.242640687 + 6 = 10.242640687 x = 10.242640687 Simplifying x = 10.242640687

Subproblem 2

x + -6 = -4.242640687 Simplifying x + -6 = -4.242640687 Reorder the terms: -6 + x = -4.242640687 Solving -6 + x = -4.242640687 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '6' to each side of the equation. -6 + 6 + x = -4.242640687 + 6 Combine like terms: -6 + 6 = 0 0 + x = -4.242640687 + 6 x = -4.242640687 + 6 Combine like terms: -4.242640687 + 6 = 1.757359313 x = 1.757359313 Simplifying x = 1.757359313

Solution

The solution to the problem is based on the solutions from the subproblems. x = {10.242640687, 1.757359313}

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