(x+2)(x-9)=104

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Solution for (x+2)(x-9)=104 equation:


Simplifying
(x + 2)(x + -9) = 104

Reorder the terms:
(2 + x)(x + -9) = 104

Reorder the terms:
(2 + x)(-9 + x) = 104

Multiply (2 + x) * (-9 + x)
(2(-9 + x) + x(-9 + x)) = 104
((-9 * 2 + x * 2) + x(-9 + x)) = 104
((-18 + 2x) + x(-9 + x)) = 104
(-18 + 2x + (-9 * x + x * x)) = 104
(-18 + 2x + (-9x + x2)) = 104

Combine like terms: 2x + -9x = -7x
(-18 + -7x + x2) = 104

Solving
-18 + -7x + x2 = 104

Solving for variable 'x'.

Reorder the terms:
-18 + -104 + -7x + x2 = 104 + -104

Combine like terms: -18 + -104 = -122
-122 + -7x + x2 = 104 + -104

Combine like terms: 104 + -104 = 0
-122 + -7x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '122' to each side of the equation.
-122 + -7x + 122 + x2 = 0 + 122

Reorder the terms:
-122 + 122 + -7x + x2 = 0 + 122

Combine like terms: -122 + 122 = 0
0 + -7x + x2 = 0 + 122
-7x + x2 = 0 + 122

Combine like terms: 0 + 122 = 122
-7x + x2 = 122

The x term is -7x.  Take half its coefficient (-3.5).
Square it (12.25) and add it to both sides.

Add '12.25' to each side of the equation.
-7x + 12.25 + x2 = 122 + 12.25

Reorder the terms:
12.25 + -7x + x2 = 122 + 12.25

Combine like terms: 122 + 12.25 = 134.25
12.25 + -7x + x2 = 134.25

Factor a perfect square on the left side:
(x + -3.5)(x + -3.5) = 134.25

Calculate the square root of the right side: 11.586630226

Break this problem into two subproblems by setting 
(x + -3.5) equal to 11.586630226 and -11.586630226.

Subproblem 1

x + -3.5 = 11.586630226 Simplifying x + -3.5 = 11.586630226 Reorder the terms: -3.5 + x = 11.586630226 Solving -3.5 + x = 11.586630226 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '3.5' to each side of the equation. -3.5 + 3.5 + x = 11.586630226 + 3.5 Combine like terms: -3.5 + 3.5 = 0.0 0.0 + x = 11.586630226 + 3.5 x = 11.586630226 + 3.5 Combine like terms: 11.586630226 + 3.5 = 15.086630226 x = 15.086630226 Simplifying x = 15.086630226

Subproblem 2

x + -3.5 = -11.586630226 Simplifying x + -3.5 = -11.586630226 Reorder the terms: -3.5 + x = -11.586630226 Solving -3.5 + x = -11.586630226 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '3.5' to each side of the equation. -3.5 + 3.5 + x = -11.586630226 + 3.5 Combine like terms: -3.5 + 3.5 = 0.0 0.0 + x = -11.586630226 + 3.5 x = -11.586630226 + 3.5 Combine like terms: -11.586630226 + 3.5 = -8.086630226 x = -8.086630226 Simplifying x = -8.086630226

Solution

The solution to the problem is based on the solutions from the subproblems. x = {15.086630226, -8.086630226}

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