x+9=2(x-2)(x-1)

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Solution for x+9=2(x-2)(x-1) equation:


Simplifying
x + 9 = 2(x + -2)(x + -1)

Reorder the terms:
9 + x = 2(x + -2)(x + -1)

Reorder the terms:
9 + x = 2(-2 + x)(x + -1)

Reorder the terms:
9 + x = 2(-2 + x)(-1 + x)

Multiply (-2 + x) * (-1 + x)
9 + x = 2(-2(-1 + x) + x(-1 + x))
9 + x = 2((-1 * -2 + x * -2) + x(-1 + x))
9 + x = 2((2 + -2x) + x(-1 + x))
9 + x = 2(2 + -2x + (-1 * x + x * x))
9 + x = 2(2 + -2x + (-1x + x2))

Combine like terms: -2x + -1x = -3x
9 + x = 2(2 + -3x + x2)
9 + x = (2 * 2 + -3x * 2 + x2 * 2)
9 + x = (4 + -6x + 2x2)

Solving
9 + x = 4 + -6x + 2x2

Solving for variable 'x'.

Reorder the terms:
9 + -4 + x + 6x + -2x2 = 4 + -6x + 2x2 + -4 + 6x + -2x2

Combine like terms: 9 + -4 = 5
5 + x + 6x + -2x2 = 4 + -6x + 2x2 + -4 + 6x + -2x2

Combine like terms: x + 6x = 7x
5 + 7x + -2x2 = 4 + -6x + 2x2 + -4 + 6x + -2x2

Reorder the terms:
5 + 7x + -2x2 = 4 + -4 + -6x + 6x + 2x2 + -2x2

Combine like terms: 4 + -4 = 0
5 + 7x + -2x2 = 0 + -6x + 6x + 2x2 + -2x2
5 + 7x + -2x2 = -6x + 6x + 2x2 + -2x2

Combine like terms: -6x + 6x = 0
5 + 7x + -2x2 = 0 + 2x2 + -2x2
5 + 7x + -2x2 = 2x2 + -2x2

Combine like terms: 2x2 + -2x2 = 0
5 + 7x + -2x2 = 0

Begin completing the square.  Divide all terms by
-2 the coefficient of the squared term: 

Divide each side by '-2'.
-2.5 + -3.5x + x2 = 0

Move the constant term to the right:

Add '2.5' to each side of the equation.
-2.5 + -3.5x + 2.5 + x2 = 0 + 2.5

Reorder the terms:
-2.5 + 2.5 + -3.5x + x2 = 0 + 2.5

Combine like terms: -2.5 + 2.5 = 0.0
0.0 + -3.5x + x2 = 0 + 2.5
-3.5x + x2 = 0 + 2.5

Combine like terms: 0 + 2.5 = 2.5
-3.5x + x2 = 2.5

The x term is -3.5x.  Take half its coefficient (-1.75).
Square it (3.0625) and add it to both sides.

Add '3.0625' to each side of the equation.
-3.5x + 3.0625 + x2 = 2.5 + 3.0625

Reorder the terms:
3.0625 + -3.5x + x2 = 2.5 + 3.0625

Combine like terms: 2.5 + 3.0625 = 5.5625
3.0625 + -3.5x + x2 = 5.5625

Factor a perfect square on the left side:
(x + -1.75)(x + -1.75) = 5.5625

Calculate the square root of the right side: 2.358495283

Break this problem into two subproblems by setting 
(x + -1.75) equal to 2.358495283 and -2.358495283.

Subproblem 1

x + -1.75 = 2.358495283 Simplifying x + -1.75 = 2.358495283 Reorder the terms: -1.75 + x = 2.358495283 Solving -1.75 + x = 2.358495283 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.75' to each side of the equation. -1.75 + 1.75 + x = 2.358495283 + 1.75 Combine like terms: -1.75 + 1.75 = 0.00 0.00 + x = 2.358495283 + 1.75 x = 2.358495283 + 1.75 Combine like terms: 2.358495283 + 1.75 = 4.108495283 x = 4.108495283 Simplifying x = 4.108495283

Subproblem 2

x + -1.75 = -2.358495283 Simplifying x + -1.75 = -2.358495283 Reorder the terms: -1.75 + x = -2.358495283 Solving -1.75 + x = -2.358495283 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.75' to each side of the equation. -1.75 + 1.75 + x = -2.358495283 + 1.75 Combine like terms: -1.75 + 1.75 = 0.00 0.00 + x = -2.358495283 + 1.75 x = -2.358495283 + 1.75 Combine like terms: -2.358495283 + 1.75 = -0.608495283 x = -0.608495283 Simplifying x = -0.608495283

Solution

The solution to the problem is based on the solutions from the subproblems. x = {4.108495283, -0.608495283}

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