(x+9)(x-3)=(x+1)*2

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Solution for (x+9)(x-3)=(x+1)*2 equation:


Simplifying
(x + 9)(x + -3) = (x + 1) * 2

Reorder the terms:
(9 + x)(x + -3) = (x + 1) * 2

Reorder the terms:
(9 + x)(-3 + x) = (x + 1) * 2

Multiply (9 + x) * (-3 + x)
(9(-3 + x) + x(-3 + x)) = (x + 1) * 2
((-3 * 9 + x * 9) + x(-3 + x)) = (x + 1) * 2
((-27 + 9x) + x(-3 + x)) = (x + 1) * 2
(-27 + 9x + (-3 * x + x * x)) = (x + 1) * 2
(-27 + 9x + (-3x + x2)) = (x + 1) * 2

Combine like terms: 9x + -3x = 6x
(-27 + 6x + x2) = (x + 1) * 2

Reorder the terms:
-27 + 6x + x2 = (1 + x) * 2

Reorder the terms for easier multiplication:
-27 + 6x + x2 = 2(1 + x)
-27 + 6x + x2 = (1 * 2 + x * 2)
-27 + 6x + x2 = (2 + 2x)

Solving
-27 + 6x + x2 = 2 + 2x

Solving for variable 'x'.

Reorder the terms:
-27 + -2 + 6x + -2x + x2 = 2 + 2x + -2 + -2x

Combine like terms: -27 + -2 = -29
-29 + 6x + -2x + x2 = 2 + 2x + -2 + -2x

Combine like terms: 6x + -2x = 4x
-29 + 4x + x2 = 2 + 2x + -2 + -2x

Reorder the terms:
-29 + 4x + x2 = 2 + -2 + 2x + -2x

Combine like terms: 2 + -2 = 0
-29 + 4x + x2 = 0 + 2x + -2x
-29 + 4x + x2 = 2x + -2x

Combine like terms: 2x + -2x = 0
-29 + 4x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '29' to each side of the equation.
-29 + 4x + 29 + x2 = 0 + 29

Reorder the terms:
-29 + 29 + 4x + x2 = 0 + 29

Combine like terms: -29 + 29 = 0
0 + 4x + x2 = 0 + 29
4x + x2 = 0 + 29

Combine like terms: 0 + 29 = 29
4x + x2 = 29

The x term is 4x.  Take half its coefficient (2).
Square it (4) and add it to both sides.

Add '4' to each side of the equation.
4x + 4 + x2 = 29 + 4

Reorder the terms:
4 + 4x + x2 = 29 + 4

Combine like terms: 29 + 4 = 33
4 + 4x + x2 = 33

Factor a perfect square on the left side:
(x + 2)(x + 2) = 33

Calculate the square root of the right side: 5.744562647

Break this problem into two subproblems by setting 
(x + 2) equal to 5.744562647 and -5.744562647.

Subproblem 1

x + 2 = 5.744562647 Simplifying x + 2 = 5.744562647 Reorder the terms: 2 + x = 5.744562647 Solving 2 + x = 5.744562647 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-2' to each side of the equation. 2 + -2 + x = 5.744562647 + -2 Combine like terms: 2 + -2 = 0 0 + x = 5.744562647 + -2 x = 5.744562647 + -2 Combine like terms: 5.744562647 + -2 = 3.744562647 x = 3.744562647 Simplifying x = 3.744562647

Subproblem 2

x + 2 = -5.744562647 Simplifying x + 2 = -5.744562647 Reorder the terms: 2 + x = -5.744562647 Solving 2 + x = -5.744562647 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-2' to each side of the equation. 2 + -2 + x = -5.744562647 + -2 Combine like terms: 2 + -2 = 0 0 + x = -5.744562647 + -2 x = -5.744562647 + -2 Combine like terms: -5.744562647 + -2 = -7.744562647 x = -7.744562647 Simplifying x = -7.744562647

Solution

The solution to the problem is based on the solutions from the subproblems. x = {3.744562647, -7.744562647}

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